What is the mechanism behind vasopressin effects? (select one) a.Storage vesicle

Question

What is the mechanism behind vasopressin effects? (select one)

a.Storage vesicles containing Aquaporin-2 are transported and fuse to the apical membrane of the collecting duct cells , increasing the rate water can diffuse through the cells.

b.Storage vesicles containing renin are transported and fuse to the apical membrane of the collecting duct cells, releasing the renin into the collecting duct lumen.

c.The levels of the Na-K-ATPase are increased in the basolateral membrane of cells of the ascending limb, increasing Na+ removed from the filtrate and therefore water too.

d.Vasopressin increases the rate at which Aquaporin-2 translocates water by increasing each channel's efficiency.

Angiotensinogen:

Is only produced by the liver when renin is in high concentrations.

Is constantly present in the blood even without renin.

Is converted to angiotensin 1 when blood pressure is high.

Which of the following occurs due to severe dehydration? (select all that apply)

The sympathetic system will increase HR.

blood vessels will vasodilate

the angiotensin pathway is activated

Na+ reabsorption is increased

the vasopressin pathway is activated

the aldosterone pathway is activated

Explanation / Answer

1.Aquaporin 2 is a water protein present in kidney in which it transmits the water across the cells using membrane channels...

Thus vasopressin or ADH acts on kidneys at proximal convoluted tubes and loop of henle activating this membrane protein Aquaporin2 channels increasing the each channel effeciency, absorbing more water at kidneys increasing Blood pressure. So the answer is D.

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