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8 Cards in this Set
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- Back
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EXAM 4 PHYSIO: RENAL 5
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EXAM 4 PHYSIO: RENAL 5
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Principal cells secrete K in response to:
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1. inc plasma K
2. inc Na load to cortical collecting duct (CCD) |
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Effects of aldosterone:
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1. stimulates LUMINAL Na channels
2. stimulates BASOLATERAL Na/K ATPase 3. stimulates LUMINAL K channels NOTE: K is sacrificed to retain Na. |
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What causes the release of aldosterone?
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1. inc plasma K
2. dec plasma vol (A II stimulates aldosterone secretion) |
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Excretion of K =
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Filtration - Reabsorption + Secretion.
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Excreted Calcium =
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Filtered - Reabsorbed
NOTE: 98% of filtered Ca is reabsorbed. |
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Excretion of Phosphate =
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Filtered - reabsorbed
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Effects of PTH on PO4 reabsorption?
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Inhibits PO4 reabsorption
Increased PTH level--> inc Ca reab--> dec PO4 reab. Decreased PTH level--> dec Ca reab --> inc PO4 reab NOTE: Plasma PO4 does not affect PTH secretion from PTH gland. |
