Renal Physio Countercurrent Mechanism

Renal Physio Countercurrent Mechanism

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Flashcard

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Professional Development

Practice Problem

Hard

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10 questions

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1.

FLASHCARD QUESTION

Front

Which of the following changes would most likely increase the efficiency of the countercurrent multiplier system?

  1. Increased blood flow in the vasa recta
, Increased permeability of the thick ascending limb to water, Increased Na+/K+/2Cl- transporter activity in the thick ascending limb, Decreased ADH secretion

Back

Increased Na+/K+/2Cl- transporter activity in the thick ascending limb

2.

FLASHCARD QUESTION

Front

Descending limb is permeable to water but not to salt.

Back

True

3.

FLASHCARD QUESTION

Front

The thick ascending limb is permeable to salts but not water.

Back

True

4.

FLASHCARD QUESTION

Front

Stimulus of ADH (Antidiuretic Hormone) release: Raised plasma osmolality

Back

Raised plasma osmolality

5.

FLASHCARD QUESTION

Front

Which structures in the nephron are responsible for establishing the countercurrent mechanism? Options: Henle’s loop and Vasa Recta, PCT and DCT, Glomerulus and Bowman’s Capsule, Collecting Ducts and Tubules

Back

Henle’s loop and Vasa Recta

6.

FLASHCARD QUESTION

Front

Which of the following is not a feature of a counter-current mechanism?
1. Helps in maintaining the osmotic gradient in the medullary interstitium
2. Helps in making the passage of water easier
3. Helps in concentrating the urine
4. Helps in diluting the urine

Back

Helps in making the passage of water easier

7.

FLASHCARD QUESTION

Front

What is the primary function of the countercurrent multiplier system in the loop of Henle?

Back

To establish a hyperosmotic medullary interstitium for water reabsorption.

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