Exam 4: Regulation of K and Ca

Question 1

What is potassium excretion or elimination determined by?

Answer 1

The sum of 3 renal processes:

1) the rate of filtration
2) tubular K+ reabsorption/secretion
3) tubular flow rate

Question 2

What is the rate of aldosterone secretion controlled by?

Answer 2

Serum K+ independently from the effect of angiotensin II

Question 3

Where is 99% of Ca?

Answer 3

Bone

Question 4

Where is Ca reabsorbed?

Answer 4

Proximal convoluted tubules

Question 5

What is PTH secretion determined by?

Answer 5

The state of calcium repletion and depletion

Question 6

What is a large influx of Ca one of the final steps in?

Answer 6

Cell death

Question 7

What is the kidney critical in the activation of?

Answer 7

Vitamin D

Question 8

What is the reabsorption of phosphates like?

Answer 8

Fairly unregulated

Question 9

When is most phosphate absorbed?

Answer 9

When it is less than the transport max

Question 10

When is most phosphate excreted?

Answer 10

When phosphate is more than the transport max