Tubular resorption/secretion Flashcards

1
Q

Angiotensin II

A

increases Na+ and water resorption in PCT, secretion of H+ (stimulation of the antiporter for Na/H); secreted due to renin secretion in response to increased SNS stimulatio

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2
Q

Aldosterone

A

released from adrenal glands in response to Ang II secretion and hyperkalemia; increases resorption of Na+ and secretion of K+ in principle cells, stimulates secretion of H+ in intercalated cells (ATPase - so also resorbs HCO3-)

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3
Q

ANP

A

released from atrial cells in response to stretching; directly inhibits Na+ reabsorption in the collecting duct and suppresses secretion of renin and ADH

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4
Q

PTH

A

released from parathyroid glands in response to hypocalcemia; increases calcium reabsorption in thick ascending LOH (stimulation of Ca/Na antiporter), decreases HPO42- reabsorption in the PCT by decreasing the symporter

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5
Q

Where are the tubules impermeable to water?

A

late DCT and CD; ascending LOH

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