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Tubular Reabsorption and Secretion

Which limb of...

Question

Which limb of loop of Henle is impermeable to water?

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Solution

The thin ascending limb of loop of Henley is impermeable to water but permeable to Na+ and cl-. So as the filtrate passes through ascending limb, it's osmolarity decreases.

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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. 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

.

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 :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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