Chapter 11 Endocrine System

Front 1

What does the endocrine system do?

Back 1

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 2

What do endocrine glands do?

Back 2

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 3

What do hormones do?

Back 3

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 4

What does the endocrine system do?

Back 4

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 5

What does the endocrine system do?

Back 5

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 6

What does the endocrine system do?

Back 6

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 7

What does the endocrine system do?

Back 7

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 8

What does the endocrine system do?

Back 8

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 9

What does the endocrine system do?

Back 9

Acts as a means of internal communications, coordinating the activities of the organ systems.

Front 10

Which glands synthesize or secrete hormones?

Back 10

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 11

What do endocrine glands do?

Back 11

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 12

What do endocrine glands do?

Back 12

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 13

What do endocrine glands do?

Back 13

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 14

What do endocrine glands do?

Back 14

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 15

What do endocrine glands do?

Back 15

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 16

What do endocrine glands do?

Back 16

Synthesize and secrete chemicals called hormones directly into the circulatory system.

Front 17

Where is the pituitary and what does it look like?

Back 17

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 18

What do hormones do?

Back 18

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 19

What do hormones do?

Back 19

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 20

What does the anterior pituitary do?

Back 20

It synthesizes both direct hormones and tropic hormones.

Front 21

What do hormones do?

Back 21

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 22

What do hormones do?

Back 22

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 23

What do hormones do?

Back 23

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 24

Which glands synthesize or secrete hormones?

Back 24

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 25

What do hormones do?

Back 25

Regulate the function of target organs or tissues. Some regulate single type of cell/organ; some have more widespread actions.

Front 26

What regulates the hormonal secretions of the anterior pituitary?

Back 26

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 27

Which glands synthesize or secrete hormones?

Back 27

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 28

Which glands synthesize or secrete hormones?

Back 28

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 29

Where is the pituitary and what does it look like?

Back 29

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 30

Which glands synthesize or secrete hormones?

Back 30

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 31

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 31

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 32

Which glands synthesize or secrete hormones?

Back 32

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 33

Which glands synthesize or secrete hormones?

Back 33

pituitary, hypothalamus, thyroid, parathyroids, adrenals, pancreas, testes, ovaries, pineal, kidneys, gastrointestinal glands, heart, thymus.

Front 34

Where is the pituitary and what does it look like?

Back 34

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 35

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 35

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 36

What does the anterior pituitary do?

Back 36

It synthesizes both direct hormones and tropic hormones.

Front 37

Where is the pituitary and what does it look like?

Back 37

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 38

Where is the pituitary and what does it look like?

Back 38

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 39

Where is the pituitary and what does it look like?

Back 39

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 40

What does the anterior pituitary do?

Back 40

It synthesizes both direct hormones and tropic hormones.

Front 41

Where is the pituitary and what does it look like?

Back 41

It is at the base of the brain and is a small trilobed gland (lobes = anterior, posterior, intermediate)

Front 42

What does the anterior pituitary do?

Back 42

It synthesizes both direct hormones and tropic hormones.

Front 43

What does the anterior pituitary do?

Back 43

It synthesizes both direct hormones and tropic hormones.

Front 44

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 44

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 45

What does the anterior pituitary do?

Back 45

It synthesizes both direct hormones and tropic hormones.

Front 46

What regulates the hormonal secretions of the anterior pituitary?

Back 46

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 47

What does the anterior pituitary do?

Back 47

It synthesizes both direct hormones and tropic hormones.

Front 48

What regulates the hormonal secretions of the anterior pituitary?

Back 48

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 49

What regulates the hormonal secretions of the anterior pituitary?

Back 49

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 50

What regulates the hormonal secretions of the anterior pituitary?

Back 50

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 51

What regulates the hormonal secretions of the anterior pituitary?

Back 51

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 52

Where is hypothalamus located? What triggers it? What does it do?

Back 52

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 53

What regulates the hormonal secretions of the anterior pituitary?

Back 53

Hypothalamic secretions called releasing/inhibiting hormones or factors

Front 54

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 54

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 55

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 55

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 56

How does the hypothalamus interact with the anterior pituitary?

Back 56

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 57

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 57

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 58

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 58

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 59

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 59

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 60

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 60

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 61

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 61

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 62

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 62

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 63

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 63

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 64

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 64

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 65

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 65

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 66

Where is hypothalamus located? What triggers it? What does it do?

Back 66

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 67

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 67

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 68

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 68

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 69

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 69

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 70

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 70

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 71

How does the hypothalamus interact with the anterior pituitary?

Back 71

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 72

Where is hypothalamus located? What triggers it? What does it do?

Back 72

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 73

Which direct hormones are synthesized by the anterior pituitary and what do they do?

Back 73

Growth hormone (aka GH or somatotropin) & prolactin

GH promotes bone and muscle growth, inhibites uptake of glucose by certain cells, and stimulates the breakdown of fatty acid, conserving glucose. GH secretion stimulated by GHRH, inhibited by somatostatin. GH deficiency can lead to dwarfism, overproduction result in gigantism/acromegaly.

Prolactin stimualates milk production and secretion in female mammary glands.

Front 74

How does the hypothalamus interact with the anterior pituitary?

Back 74

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 75

Where is hypothalamus located? What triggers it? What does it do?

Back 75

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 76

Which tropic hormones are synthesized by the anterior pituitary and what do they do?

Back 76

adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH)

ACTH stimulates adrenal cortex to synthesize and secrete glucocorticoids and is regulated by releasing hormone corticotropin releasing factor (CRF)

TSH stimulates thyroid gland to absorb iodine and synthesize and relase thyroid hormone. Regulated by releasing hormone TRH.

LH stimulates ovulation and formation of corpus luteum. In males LH stimulates interstitial cells of testes to synthesize testosterone. Regulated by estrogen, progesterone, GnRH).

FSH in females causes maturation of ovarian follicles; in males FSH stimulates maturation of the seminiferous tubules and sperm production. Regulated by estrogen and GnRH.

Front 77

How does the hypothalamus interact with the anterior pituitary?

Back 77

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 78

What does the posterior pituitary store and release? What do they do? What regulates the secretion of these hormones?

Back 78

Stores and releases oxytocin and ADH. Stimulated by action potentials descending from hypothalamus.

Oxytocin increases strength and frequncy of uterine muscle contractions; stimulates milk secretion in mammary glands.

ADH (antidiuretic hormone, vasopressin) increases permealbiloity of nephron's collecting duct to water, promoting water reabsorption and increasing blood volume. Secreted when plasma osmolarity increases, as sense by osmoreceptors in hypothalamus, or when blood volume decreases, as sense by baroreceptors in circ. system.

Front 79

Where is hypothalamus located? What triggers it? What does it do?

Back 79

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 80

Where is hypothalamus located? What triggers it? What does it do?

Back 80

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 81

How does the hypothalamus interact with the anterior pituitary?

Back 81

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 82

How does the hypothalamus interact with the anterior pituitary?

Back 82

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.

Front 83

Where is hypothalamus located? What triggers it? What does it do?

Back 83

It is part of the forebrain and is located directly above teh pituitary gland. Receives neural transmissions from other parts of th ebrain and from peripheral nerves that trigger specific responses from its neurosecretory cells. The cells regulate pituitary gland secretions via negative feedback mechanisms and through the actions of inhibiting/releasing hormones.

Front 84

How does the hypothalamus interact with the anterior pituitary?

Back 84

Hypothalamic releasing hormones are hormones that stimulate or inhibit the secretions of the anterior pituitary. GnRH stimulates the anterior pituirary to secrete FSH and LH. Releasing hormones are secreted into the hypothalamic-hypophyseal portal system. In this circulatory pathway, blood from teh capillary bed in the hypothalamus flows through a portal vein into the anterior pituitary, where it diverges into a 2nd capillary network. In this way, releasing hormones can immediately reach the anterior pituitary.