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Flashcards in Renal Regulation of Ions Deck (12)
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0
Q

What does increase in the extracellular potassium level do?

A

Stimulates increase in aldosterone secretion.

1
Q

What is the normal intracellular concentration of potassium ions?

A

140 mEQ/L

2
Q

Where does reabsorption of the potassium ions occur?

A

In the proximal tubule and the ascending loop of Henle.

3
Q

Where does the secretion of Potassium ions occur?

A

The late tubule and collecting duct.

4
Q

What stimulated potassium secretion by the principal cells, in the late distal tubule and cortical collecting tubules?

A

Potassium concentration and aldosterone.

5
Q

What does small changes in potassium concentration cause?

A

Large changes in aldosterone secretion by adrenals.

6
Q

Increased sodium intake decreases aldosterone secretion and, therefore, potassium excretion:

A

however, increased sodium intake also increases GFR and decreases proximal tubular reabsorption of sodium

7
Q

What decreases Calcium excretion?

A

Increased levels PTH, plasma concentration of phosphate, and metabolic acidosis

8
Q

What stimulates the uptake of potassium by cells?

A

Insulin and aldosterone

9
Q

What results from an excess secretion of aldosterone (conn’s syndrome)?

A

Hypokalemia

10
Q

What results from a deficiency in aldosterone secretion(Addison’s disease)?

A

Hyperkalemia

11
Q

How much calcium is reabsorbed by the kidneys?

A

Almost all of it.