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61 Cards in this Set
- Front
- Back
two systems of internal communication and regulation in animals
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nervous system and encocrine system
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hormones may reach all parts of the body
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BUT only certain types of cells are equipped to respond - target cells
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system involving electrical signals
-rapid short duration |
nervous system
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system involving chemical signals
-longer response time, longer acting |
endocrine system
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-organic molecules, formed and secreted in one location, transported to another location where they exert their effects
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hormones
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-release their secretions into ducts that lead to the outside of the body or into the digestive tract
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exocrine glands
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ductless, hormone-producing glands that release their secretions into blood
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endocrine glands
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-pancreas exocrine
-pancreas endocrine |
-enzymes
-hormones |
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three major classes of molecules that function as hormones in vertebrates
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-proteins and peptides
-amines derived from amino acids -steroids |
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cells with receptors for hormones
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target tissue
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hypothalamus hormone
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hormones released from the posterior pituitary and hormones that regulate the anterior pituitary
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pituitary gland hormone (posterior)
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oxytocin, antidiuretic hormone
-releases neurohormones made in hypothalamus |
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pituitary gland hormone (anterior)
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growth hormone, prolactin, follicle stimulating hormone (FSH), luteinizing hormone (LH), thyroid stimulating hormone (TSH), adrenocorticotropic hormone (ACTH)
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thyroid gland hormone
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triiodothyronine and thyroxine, calcitonin
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parathyroid gland hormone
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parathyroid hormone - raises blood calcium level
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pancreas hormones
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insulin, glucagon
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adrenal glands - medulla - hormone
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epinephrine and norephinephrine
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gonads hormone - testes
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androgens
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gonads hormone - ovaries
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estrogen, progesterone
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pineal gland hormone
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melatonin
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cells in hypothalamus that synthesize peptide hormones, store them, and release them
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neurosecretory cells
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pea-sized gland that dangles from hypothalamus by a stalk
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pituitary gland
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two lobes in the pituitary gland
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anterior pituitary and posterior pituitary
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function of thyroid stimulating hormone
-which gland? |
-stimulate release of thyroid hormones
-adenohypophysis |
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function of follicle stimulating hormone (FSH)
-gland? |
females - estrogen secretion and egg maturation
male - stimulate sperm formation -adenohypophysis |
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gland of growth hormone
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adenohypophysis (part of pituitary gland)
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function of antidiuretic hormone (ADH)
gland? |
enhances water reabsorption in kidneys
-neurohypophysis |
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function of oxytocin
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induces uterine contractions and milk ejection
-neurohypophysis |
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-describe interaction between hypothalamus and pituitary gland posterior
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1. cell bodies of secretory neurons in hypothalamus synthesize ADH and oxytocin
2.hormones move down axons of secretory neurons 3. action potential triggers release of hormones and enter blood capillaries in posterior pituitary 4. small blood vessels deliver hormones to general circulation |
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-describe interaction between hypothalamus and pituitary gland anterior
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1. cell bodies of secretory neurons secrete releasing and inhibiting hormones
2. first capillary bed in base of hypothalamus picks up hormones 3. hormones go to second capillary bed in anterior pituitary 4. releasing or inhibiting hormones diffuse out of capillaries and act on endocrine cells in anterior 5. hormones secreted from anterior go to general circulation |
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examples of abnormal pituitary output
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gigantism, dwarfism
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-promotes growth directly and stimulates the production of growth factors by other tissues
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growth hormone
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-functions of insulin,glucagon
-gland? |
insulin - lowers blood sugar
glucagon - raises blood sugar -pancreas |
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how does normal blood sugar work?
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starch forms glucose and blood glucose level goes up, triggers insulin release, blood level sugar goes down, triggers glucagon, breakdown into glucose, raise blood glucose level,
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beta cells
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insulin
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alpha cells
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glucagon
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type 1 diabetes
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insufficient insulin keeps blood sugar level up
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chart in endocrine system powerpoint
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blood glucose level control
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key terms
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go over them!!
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effect of hormones in target cells
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gene activation, protein synthesis, alterations in existing enzymes
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pathway of a water soluble hormone
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exocytosis out of cell, into blood stream directly, and go onto signal receptor on target cell membrane
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pathway of a lipid soluble hormone
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diffuses out of secretory cell, into bloodstream and met by transport protein, then diffuses into target cell and then binds to an intracellular signal receptor
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all organs involved with the human endocrine system head to feet
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pineal gland, hypothalamus, pituitary gland, thyroid glands, parathyroid glands, thymus, adrenals, pancreas, ovary/testes
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where are the parathyroid glands located relative to thyroid
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ON DA BACK YO
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important in long distance signaling, one of many types of secreted chemicals that are formed in specialized cells and travel through body fluids to target cells
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hormone
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a DUCTLESS gland that secretes hormones directly into the interstitial fluid, from which they diffuse into the bloodstream
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endocrine gland
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an extension of the hypothalamus composed of nervous tissue that secretes oxytocin and ADH made in hypothalamus; temp storage
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posterior pituitary = neurohypophysis
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a hormone that is produced and secreted by the anterior pituitary and has direct and tropic effects on a wide variety of tissues
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growth hormone
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hormone secreted by beta cells that lower blood glucose levels; promotes uptake of glucose by most body cells
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insulin
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a small gland on the dorsal surface of the vertebrate forebrain that secretes the hormone melatonin
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pineal gland
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an endocrine gland located on the ventral surface of trachea that secretes what?
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thyroid gland
-T3, T4, calcitonin |
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one of four small endocrine glands embedded in the surface of the thyroid gland, that secrete what?
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parathyroid gland,
parathyroid hormone |
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one of two endocrine glands located adjacent to kidneys in mammals; deal with stress
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adrenal glands
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the ventral part of the vertebrate forebrain; functions in maintaining homeostasis; releasing factors that regulate the anterior pituitary
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hypothalamus
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a portion of the pituitary with NONNEURAL TISSUE; consists of endocrine cells that synthesize and secrete several hormones
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anterior pituitary
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a gland with exocrine and endocrine tissues; endocrine = insulin, glucagon
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pancreas
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a hormone secreted by alpha cells that raises blood glucose level. promotes glycogen breakdown and release of glucose by liver
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glucagon
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any hormone that stimulates the development of female reproductive system and secondary sex characteristics
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estrogen
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any steroid with progesterone (prepares uterus for pregnancy) like activity
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progestin
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inability to maintain glucose homeostasis
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diabetes
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hormone that stimulates adrenal cortex to secrete glucocorticoids
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adrenocorticotropic hormone
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