PHGY 210 Lecture Notes - Lecture 7: Libido, Lactic Acid, Zona Glomerulosa
25 Apr 2018
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Document Summary
Six main functions: maintains constant internal environment via regulation of metabolism and water/ electrolyte balance, adaptive stress response, growth and development, reproduction, red blood cell production, integration with autonomic ns in regulating both circulation and digestive functions. Are chemical substances that are secreted directly into the blood stream at low quantities: exerts physiological effect at a distant target tissue/ organ. Low lipid solubility: unbound to carrier molecules within the plasma, peptides (short chain a. a. ) or proteins (longer chain a. a. ) . Peptide hormones: other major group = amines. Poor solubility in water: generally, requires carrier molecules for transport. Two types of amine hormones: catecholamines norepinephrine and epinephrine both free and bound to carrier molecules, thyroid hormones not. Enz within cell of tissue determines which steroid hormone is produced: for cholesterol, key enz = found only in adrenal cortex only this organ can make cholesterol.
