Final Review: Renal Regulation of Ions Flashcards Preview

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Flashcards in Final Review: Renal Regulation of Ions Deck (13)
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0
Q

What does the increase in extracellular K+ stimulate?

A

Increase in aldosterone secretion

1
Q

What is the normal intracellular concentration of K+ ion?

A

140 mEQ/L

2
Q

Where does reabsorption of K+ ion occur in the kidneys?

A

Proximal tubule & ascending limb of Henle

3
Q

Where does secretion of K+ occur in the kidneys?

A

Late tubule and collecting duct

4
Q

What is K+ secretion by principal cells stimulated by?

A

K+ concentration & aldosterone

5
Q

_______ changes in K+ concentration cause _______ changes in aldosterone secretion by adrenals.

A

Small

Large

6
Q

What does increased Na+ intake decrease?

A

Aldosterone, and, therefore, K+ excretion

7
Q

What does increased Na+ increase?

A

GFR & decreases proximal tubular reabsorption of Na+

8
Q

What situations decrease Ca++ excretion?

A

Increased PTH levels
Plasma concentration of phosphate
Metabolic acidosis

9
Q

What stimulates uptake of K+ by cells?

A

Insulin & aldosterone

10
Q

What does Hypokalemia result from and what’s the clinical term for it?

A

Excess secretion of aldosterone

Conn’s syndrome

11
Q

What does hyperkalemia result from and what’s the clinical name for it?

A

Deficiency in aldosterone secretion

Addison’s disease

12
Q

How much of the filtered Ca++ is reabsorbed by the kidneys?

A

Almost all of it