1- Principal cells
secrete H+ to adjust acid/base balance
secrete K+ to adjust for dietary changes
have Ca2+ leak channels
all of the above

2- When osmoreceptors in the hypothalamus detect increased plasma osmolarity
the pituitary releases renin
the hypothalamus releases ADH
the hypothalamus releases aldosterone
none of the above

3- Increases the osmolarity of the medula
countercurrent mechanism
urea recycling
sympathetic stimulation
1st and 2nd are correct

4- Enzyme found in lung tissue
renin
angiotensinogen
angiotensin converting enzyme
atrial natriuretic peptide

5- Angiotensin II
decreases GFR by vasoconstriction of arterioles
increases water, Na+ and Cl- reabsorption by stimulating Na+/H+ antiporters
stimulates aldosterone and ADH release
all of the above

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Answers:

1- Principal cells
Answer: secrete K+ to adjust for dietary changes

2- When osmoreceptors in the hypothalamus detect increased plasma osmolarity
Answer: none of the above (the hypothaalamus signals the pituitary to release ADH)

3- Increases the osmolarity of the medula
Answer: 1st and 2nd are correct (countercurrent mechanism AND urea recycling)

4- Enzyme found in lung tissue
Answer: angiotensin converting enzyme

5- Angiotensin II
Answer: all of the above (decreases GFR by vasoconstriction of arterioles AND increases water, Na+ and Cl- reabsorption by stimulating Na+/H+ antiporters AND stimulates aldosterone and ADH release)