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20 Cards in this Set
- Front
- Back
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Endocrine system |
—specialized cells throughout body —secretes chemicals called hormones |
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System works together Shared goal is homeostasis |
Endocrine and nervous system |
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Ductless glands Secrete hormones directly in bloodstream |
Endocrine system |
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Cell of many different organs are exposed to a particular hormone |
Targeted cells |
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Hormone acts only on cell which receptors are specify to that hormone |
Specificity |
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How are hormones classified? |
Steroid or nonsteroids |
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Synthesized from cholesterol Make up male and female sex hormones Aldosterone |
Steroid |
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Synthesized from amino acids |
Nonsteroid lipid based |
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Can divide protein hormone such as insulin, peptide hormones |
Nonsteroid |
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Can be anywhere in the body |
Target cells |
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Binds with receptors to trigger changes with in the cell |
Target cells |
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Can pass easily through a cell membrane |
Steroid hormone |
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Protein based hormones cannot penetrate cell membrane Bind with receptors on cell surface |
Second messenger |
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Activates specific enzymes |
Second messenger |
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Works in conjunction with hypothalamus |
Pituitary gland |
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Exerts more influence on body processes than any other endocrine system |
Pituitary gland |
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Tiny pea size , sits underneath hypothalamus. Cradled in sella turcica, cavity with in sphenoid bone |
Pituitary gland |
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Pituitary gland divide into two sections |
Anterior pituitary Posterior pituitary |
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Neurons of the hypothalamus release their hormones into a system of blood vessels |
Hypophyseal portal system |
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System of blood vessels connect the hypothalamus with the anterior pituitary Receives hormones released by the hypothalamus |
Hypophyseal portal system |
