1001 bio ek- water movement Q4

[nr6unhH]

for question number 4, the explanation says "water would then follow the movement of sodium into the cell" when Na+/K+ ATPase does not function.. why does water follow movement of sodium? not potassium?

is this same concept as how Aldosterone in Adrenal Cortex would "reduce Na+ excretion; increases K+ excretion; raises blood pressure?

like since more Na+ will stay in blood rather than urine, water follows movement of sodium, more water in the blood, more blood more blood pressure??? is this the logic?

thanks!

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[fizzgig]

isn't this bc the na/k pump is a 3na to 2k ratio? so whichever way the sodium is being pumped is actually getting more ions total. that's why water follows sodium, not because of some property of it or anything.

 

[rls303]

isn't this bc the na/k pump is a 3na to 2k ratio? so whichever way the sodium is being pumped is actually getting more ions total. that's why water follows sodium, not because of some property of it or anything.

So the movement of water is indicative of it's osmotic gradient in this scenario?

 

[fizzgig]

yes, water is following an osmotic gradient which the 3Na/2K pump is building up. methinks.