iphy 3430 lecture 12

iphy 3430 lecture 12 - Kidney also regulates RBCs and...

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Exchange of materials in capillaries When the blood reaches the capillaries, some materials diffuse out/in between the blood and cells, but diffusion is pretty slow. So, water is moved by bulk flow out of the capillaries, moving all water soluble materials to the cells, and then most of the water is restored back to the circulation, carrying wastes.
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Forces: Capillary blood pressure (outward) Plasma colloid osmotic pressure (inward) beginning end BP = 37 BP = 17 COP = 25 COP = 25 37-25 = 12 out 25-17 = 8 in
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Lymph circulation picks up the rest unabsorbed “water” containing wastes, ions, etc from extracellular fluid space loose plasma proteins loose red blood cells cell debris pathogens
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Excretory System Roles: remove wastes balance body water content balance body ionic content balance acid-base balance
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Unformatted text preview: Kidney also regulates RBCs and secretes renin as part of regulation of blood pressure Kidney: by regulating blood water, ionic and H+ content, can regulate extracellular fluid and cell water, ionic and H+ content Extracellular fluid blood Water, ions and H+ If blood water drops, increase blood ion content, and withdraw water from extracellular tissues, and then water would leave cell Osmotic pressure Water will always move from an area of low solute concentration (osmotic pressure) to high solute concentration (osmotic pressure)--no matter what the size or charge of the solute molecules. Plus, 1. adrenal gland (aldosterone) 2. hypothalamus and posterior lobe of the pituitary (vasopressin) 3. Heart atrium (atrial natriuretic factor)...
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This note was uploaded on 05/25/2008 for the course IPHY 3430 taught by Professor Lynch,robe during the Summer '08 term at Colorado.

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iphy 3430 lecture 12 - Kidney also regulates RBCs and...

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