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In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): The final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron, resuliting in the production of hyperosmotic urine.
Reason(R): The loop of Henle is responsible for the formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney.
  • a)
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • b)
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • c)
    Assertion is true but reason is false.
  • d)
    Both assertion and reason are false.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In the following question, a statement of Assertion(A) is given follow...
The effect of collecting duct depends on the prescence of vasopressin. This hormone increases the permeability of the collecting duct to water. Gradually the rate of reabsorption from the filterate increases and it becomes hyperosmotic.
Loop of Henle is a U-shaped tubular part which lies in the renal medulla, which has a thin walled permeable descending limb and thick walled impermeable ascending limb.Na+, K+ and Cl- are transported out of thick segement of ascending limb.
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Most Upvoted Answer
In the following question, a statement of Assertion(A) is given follow...
Assertion: The final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron, resulting in the production of hyperosmotic urine.

Reason: The loop of Henle is responsible for the formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney.

Explanation:
The assertion states that the final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron, resulting in the production of hyperosmotic urine. This is correct because the collecting duct plays a crucial role in the concentration of urine. As urine passes through the collecting duct, water is reabsorbed back into the bloodstream, resulting in a concentrated urine with a high osmolarity.

The reason states that the loop of Henle is responsible for the formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney. This is also correct. The loop of Henle, which consists of the descending and ascending limbs, plays a major role in establishing a concentration gradient in the kidney. The descending limb is permeable to water but not to ions, allowing water to passively leave the tubule and enter the interstitium, thus increasing the osmolarity of the interstitial fluid. On the other hand, the ascending limb is impermeable to water but actively transports ions, particularly sodium, out of the tubule and into the interstitium. This creates a concentration gradient of sodium ions along the length of the loop of Henle, with higher concentrations towards the medulla.

The concentration gradient established by the loop of Henle is necessary for the reabsorption of water in the collecting duct. The high osmolarity of the interstitium drives the passive movement of water out of the collecting duct and into the interstitium. This reabsorption of water concentrates the urine and conserves water in the body.

Therefore, both the assertion and reason are true, and the reason provides the correct explanation for the assertion. Thus, the correct answer is option B.
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In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).Read the statements carefully, and mark the correct answer.Assertion(A): The final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron, resuliting in the production of hyperosmotic urine.Reason(R): The loop of Henle is responsible for the formation of a sodium gradient across the depth of the cortical interstitium of a mammalian kidney.a)Both assertion and reason are true and reason is the correct explanation of assertion.b)Both assertion and reason are true but reason is not the correct explanation of assertion.c)Assertion is true but reason is false.d)Both assertion and reason are false.Correct answer is option 'B'. Can you explain this answer?
Question Description
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