Home
Class 11
BIOLOGY
Assertion : Normal urine of man is hyper...

Assertion : Normal urine of man is hypertonic than the blood plasma.
Reason : Counter-current mechanism of loop of Henle and Renin enzyme of juxta-glomerular cells increase the `Na^(+)` concentration in the adrenal medulla.

A

If both Assertion and Reason are true and Reason is correct explanation of the Assertion.

B

If both Assertion and Reason are true but Reason is not correct explanation of the 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 "Normal urine of man is hypertonic than the blood plasma." This means that the concentration of solutes in urine is higher than that in blood plasma. - This is true because the kidneys have the ability to concentrate urine, primarily through the actions of the nephron, specifically the loop of Henle. 2. **Understanding the Reason**: - The reason provided is that "Counter-current mechanism of loop of Henle and Renin enzyme of juxta-glomerular cells increase the `Na^(+)` concentration in the adrenal medulla." - The counter-current mechanism in the loop of Henle plays a crucial role in concentrating urine by creating a gradient that allows for the reabsorption of water and sodium ions. - However, the mention of the renin enzyme affecting sodium concentration in the adrenal medulla is misleading. Renin primarily affects blood pressure and fluid balance, and its main action is on the angiotensin system, which regulates sodium reabsorption in the kidneys rather than directly increasing sodium concentration in the adrenal medulla. 3. **Evaluating the Truth of Assertion and Reason**: - Both the assertion and the reason are true statements. The assertion is correct about urine being hypertonic, and the reason discusses mechanisms that are involved in urine concentration. - However, the reason does not correctly explain the assertion as it inaccurately relates the role of renin to sodium concentration in the adrenal medulla. 4. **Conclusion**: - The correct option is that both the assertion and reason are true, but the reason is not a correct explanation of the assertion. ### Final Answer: Both assertion and reason are true, but reason is not a correct explanation of assertion. ---
Promotional Banner

Topper's Solved these Questions

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(E. ADDITIONAL MULTIPLE CHOICE QUESTIONS: )|30 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    MODERN PUBLICATION|Exercise Chapter Practice Test|12 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(C. MATCHING TYPE QUESTIONS: )|3 Videos

  • DIGESTION AND ABSORPTION

    MODERN PUBLICATION|Exercise Chapter Practice Test|12 Videos

  • LOCOMOTION AND MOVEMENT

    MODERN PUBLICATION|Exercise OBJECTIVE TYPE QUESTIONS|2 Videos

Similar Questions

Explore conceptually related problems

Assertion :- Mammals have the ability to produce a concentrated urine. Reason :- Counter current mechanism occurs in vasa recta and Henle's loop.

Assertion :- Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed. Reason :- Counter current mechanism helps to maintain a concentration gradient in the medullary interstitium.

Assertion: The Henle's loop and vasa recta play a significant role in producing a concentrated urine. Reason: The counter current arrangement of Henle's loop and vasa recta helps in this.

Assertion: The two limbs of Henle ’s loop fonns a counter current Reason: The flow of blood in the two limbs of Henle’s loop is in opposite direction.

Assertion : In the descending limb of loop of Henle , the urine is hypertonic , while in ascending limb of loop of Henle , the urine is Hypotonic . Reason : Descending limb is impermeable to Na' while ascending limb is impermeable to H_(2)O

The increase in osmolarity from outer to inner medullary interstitium is maintained due to : (i) Close proximity between Henle's loop and vasa recta (ii) Counter current mechanism (iii) Selective secretion of HCO 3¯ and hydrogen ions in PCT (iv) Higher blood pressure in glomerular capillaries

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),(A." PCT",(i)." Minimum reabsorption"),(B." DCT",(ii)." Filtration of blood"),(C." Loop of Henle",(iii)." Reabsorption of 70-80% electrolytes"),(D." Counter current mechanism",(iv)." Ionic balance"),(E." Renal corpuscle",(v)." Maintenance of concentration gradient in medulla"):}

Assertion: In the descending limb of loop of Henle the urine is hypotoonic, while in ascending limb of loop of Henle, the urine is hypertonic. Reason: Descending limb is impermeable to water while ascending limb is impermeable to Na^(+)