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lecture 18 Renal Control sq key

lecture 18 Renal Control sq key - 2 Why is Na reabsorption...

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Short answers to Study questions for lecture 18 1.a. How is it possible for the kidneys to control ECF osmolarity and volume by controlling plasma osmolarity and volume? Blood plasma exchanges with interstitial fluid in all the capillary beds. b. What is the main renal control system that maintains homeostasis of ECF osmolarity? The negative feedback control system that uses hypothalamic osmoreceptors to control release of vasopressin, which modulates water permeability of the collecting ducts. c. What is the main control system that maintains homeostasis of ECF volume? The renin-angiotensin-aldosterone negative feedback control system that controls [Na] in plasma.
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Unformatted text preview: 2. Why is Na reabsorption also controlled by feedback systems regulating atrial stretch and MAP? [Na] largely determines ECF fluid volume, which also determines blood pressure. 3. a. For what substances is tubular secretion the primary mechanism of homeostasis? Potassium ions, hydrogen ions and organic ions. b. What is the ‘engine’of tubular secretion? The Na/K ATPase c. What hormone most affects potassium secretion? Aldosterone 4. By what mechanisms in acid/base balance of the ECF maintained? Buffering systems in the plasma, control systems related to breathing, and the control system involving tubular secretion of H + and reabsorption of HCO3-...
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