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Tubular Reabsorption and Secretion

Assertion :In...

Question

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.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In the descending loop of Henle, urine is hypertonic while in ascending loop urine is hypotonic because the Descending loop is permeable to water and impermeable to Na+ while ascending loop is impermeable to water and permeable to sodium.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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Similar questions

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

N a^{+}

,while ascending limb is impermeable to

H_{2} O

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

H_{2} O

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.

Q. Assertion :While going down the loop of Henle, the filtrate becomes hypotonic. Reason: The descending limb of loop of Henle is impermeable to both water and electrolytes.

Q. Assertion :The renal fluid becomes increasing concentrated when it flows down in the descending limb of loop of Henle towards inner medulla, but its concentration decreases in the ascending limb when it flows towards the cortex. Reason: The descending limb of the loop of Henle water is reabsorbed, the ascending limb is impermeable to water but salt are absorbed.

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