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Assertion: DCT and collecting duct maint...

Assertion: DCT and collecting duct maintain the pH and ionic balance of blood.
Reason: DCTs of many nephrons open into a collecting duct.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

if both assertion and reason are true but reason is not the correct explanation of assertion.

C

if assertion is true but reason is false

D

if both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the Distal Convoluted Tubule (DCT) and the collecting duct play a role in maintaining the pH and ionic balance of blood. This is true because both structures are involved in the reabsorption and secretion processes that regulate these balances. 2. **Function of the DCT**: - The DCT is responsible for the conditional reabsorption of substances such as bicarbonates (HCO3-) and the selective secretion of ions like potassium (K+), hydrogen (H+), and ammonium (NH4+). This process helps in regulating blood pH and maintaining ionic balance. 3. **Function of the Collecting Duct**: - The collecting duct also contributes to the maintenance of pH and ionic balance by allowing the reabsorption of water and the selective secretion of urea, hydrogen ions, and potassium ions. This further aids in concentrating urine and regulating the body's overall fluid and electrolyte balance. 4. **Understanding the Reason**: - The reason states that the DCTs of many nephrons open into a collecting duct. This is a factual statement and is true. However, it does not explain why the assertion about maintaining pH and ionic balance is true. 5. **Conclusion**: - Both the assertion and the reason are true statements. However, the reason does not serve as a correct explanation for the assertion. Therefore, the answer to the question is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion. ### Final Answer: Both assertion and reason are true, but reason is not the correct explanation for the assertion. ---
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