HP 1420 Study Guide - Midterm Guide: Extracellular Fluid, Axon Hillock, Perineurium

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31 Mar 2017
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Endocrine system: characteristics-endo means within and krino means to secrete, the endocrine system is composed of endocrine glands and specialized endocrine cells located throughout the body, secrete very small amounts of chemical messengers called hormones into the bloodstream. Then the hormones circulate to target tissues (effectors), small intercellular spaces, same distance. Function: control food intake and digestion, regulate metabolism, regulate ion levels, control of water balance, simulation of urine contraction and milk release, changes in heart rate and blood pressure. Pituitary gland (hypophysis): produces hormones for body functions. Posterior pituitary gland (neurohypophysis): it is called this because it is continuous/extension with the hypothalamus in the brain (neuro refers to the nervous system). The infundibulum connects the posterior lobe with the hypothalamus. Hormones: neuropeptides or neurohormones (can directly release hormones bc there is no portal system) Response-increased water reabsorption (less water is lost in the form of urine) Response- increased uterine contractions, milk expulsion from mammary glands, unclear function in males.

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