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Tubular Reabsorption and Secretion

Ascending loo...

Question

Ascending loop of Henle is

A

Permeable to sodium ions

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B

Impermeable to water

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C

Both A and B

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D

Permeable to water but impermeable to sodium ions

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Solution

The correct option is D Both A and B
Ascending loop of henle is permeable to Sodium ions, Potassium ions, and Chloride ions. These are reabsorbed by active transport.

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Q. Select the statements which are correct with respect to loop of Henle in a nephron.
1) Ascending limb of loop of Henle is impermeable to electrolytes, but is permeable to water.
2) Descending limb of loop of Henle is permeable to water but is impermeable to electrolytes
3) Both ascending and descending limbs are permeable to water.
4) Reabsorption is minimum in the ascending limb of loop of Henle.

Q. The ascending limb of Henle and the early distal tubule are __(i)__ to water. These regions actively transport __(ii)__ out of the filtrate and into the surroundings.

Compare the statements :

Statement A. When the urine moves through the descending limb, it becomes hypertonic and as it passes through the ascending limb of loop of Henle, it becomes hypotonic

Statement B. The descending limb is permeable to sodium ions, while the ascending limb is impermeable to sodium ions

Q. Assertion :In descending loop of Henle, urine is hypertonic while in ascending loop urine is hypotonic. Reason: Descending loop is impermeable to

N a^{+}

while ascending loop is impermeable to water.

Q. Assertion :When urine moves through the descending limb, it becomes hypertonic and as it passes through the ascending limb of Henle's loop, it becomes hypotonic. Reason: The descending limb is permeable to sodium ions, while the ascending limb is impermeable to sodium ions.

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