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The nephron is a hollow, convoluted tube...

The nephron is a hollow, convoluted tube of cells. It is engineered to concentrate urine by removing water at which of the following sites?
I. Proximal convoluted tubule
II. Descending limb of the loop of Henle
III. Ascending limb of the loop of Henle

A

I only

B

II only

C

I and II only

D

I, II and III

Text Solution

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The correct Answer is:
C
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Which of the following statements is/are true? (i) Urine is hypertonic in distal convoluted tubule. (ii) When the urine passes into the collecting tubule, it becomes hypotonic. (iii) Urine is isotonic in proximal convoluted tubule. (iv) Urine becomes more and more hypotonic as it passes through the Henle's loop.

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

Statement-1 : In the descending limb of loop of Henle, the urine is hypertonic, which in ascending limb of loop of Henle, the urine is hypotonic. Statement-2 : Descending limb is impermeable to sodium, while ascending limb is impermeable to water.

Ascending limb of Henle’s loop is ____________to water whereas the descending limb is___________to it.

Which of the following hormone/enzyme is/are correctly paired with its function? I. Renin - Enzyme that catalyses the formation of angiotensin I. II. Aldosterone - Regulate water reabsorption at the distal convoluted tubule. III. Antidiuretic hormone -It is a powerful vasoconstrictor that stimulates the secretion of aldosterone. IV. Angiotensin II - Promotes reabsorption of sodium at distal convoluted tubule.

TRUEMAN BIOLOGY-EXCRETORY PRODUCTS AND THEIR ELIMINATION-MULTIPLE CHOICE OUESTIONS
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  5. NaCl is more in the interstitial fluid of renal medulla than of cortex...

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  6. Water from the two tanks shown in the diagram was tested 3 hours after...

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  7. Antidiuretic hormone has the most abundant receptors in the kidneys of

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  9. Which of the following statements is correct?

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  10. The pH of human urine is approximately

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  11. Which one of the following statements is incorrect?

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  13. Which one of the following statements is incorrect?

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  17. Which one of the following four secretions is correctly matched with i...

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  18. Which one of the following statements is correct with respect to salt ...

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  19. Find out the correct statement about the loop of Henle

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