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Tubular Reabsorption and Secretion

Ascending lim...

Question

Ascending limb of Henle's loop is ............ to water whereas, the descending limb is .............. to it.

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Solution

Ascending limb of henle's loop is impermeable to water due to the absence of aquaporins. Descending limb is highly permeable to water due to the presence of many aquaporins.

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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. Fill in the blanks with appropriate words.

Ascending limb of Henles loop is.......... to water whereas the descending limb is.......... to it.

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 :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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