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Unformatted text preview: Lecture #21 Endocrinology I I I) Adrenal Glands (located above kidneys) a. Adrenal Medulla (inner portion of adrenals) i. Hormones: epinephrine (adrenalin) & norepinephrine (noradrenalin) both are made from tyrosine ii. Functions: Fight-or-Flight Response 1. Increase blood pressure, heart rate, glucose supply, vasoconstriction to viscera, vasodilation to skeletal muscle , heart & brain. Note: a) last 10x longer effect than sympathetic nervous system input b) hits some target not reached by sympathetic nervous system iii. Hormone Release controlled by nerve input : Splanchnic nerve b. Adrenal Cortex (outer layer of adrenals) steroid hormones (3 types) i. Glucocorticoids: regulate carbohydrate to protein metabolism Long- Term stress relief (i.e cortisol) 1. Increase blood glucose, synthesis of glucose (in liver), mobilize fats for energy, and decrease amino acid uptake & protein synthesis ii. Mineralocorticoids: regulates ion concentrations in body fluids. (i.e aldosterone)...
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- Spring '11