I: | Allows passage of small amounts of urea into the medullary interstitium |
II: | Large amounts of water could be reabsorbed from this part to produce a concentrated urine. |
1. | Only I | 2. | Only II |
3. | Both I and II | 4. | Neither I nor II |
I: | Glomerulus is a tuft of capillaries formed by the efferent arteriole |
II: | Afferent arteriole forms the peritubular capillary network |
III: | Vasa recta is absent or highly reduced in juxtamedullary nephrons |
1. | Only III is correct |
2. | I is correct but II and III are incorrect |
3. | I, II and III are incorrect |
4. | I and II are correct |
I: | is lined by cuboidal brush bordered epithelium |
II: | reabsorbs 70-80 percent of electrolytes and water |
1. | Proximal convoluted tubule |
2. | Loop of Henle |
3. | Distal convoluted tubule |
4. | Collecting duct |
Match the parts of the nephron in Column I with function/feature in Column II and select the answer from the codes given:
Column I | Column II | ||
A. | PCT | a. | Maximum reabsorption of water and electrolytes |
B. | Loop of Henle - descending limb | b. | Permeable to water but almost impermeable to electrolytes |
C. | Loop of Henle - ascending limb | c. | Impermeable to water but permeable to electrolytes |
D. | DCT | d. | Conditional reabsorption of Na+ and water |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | b | a | d | c |
3. | a | b | d | c |
4. | b | a | d | c |
1. | Glomerulus is a tuft of capillaries formed by afferent arteriole. |
2. | Blood from the glomerulus is carried away by an efferent arteriole. |
3. | Vasa recta is well developed in cortical nephrons. |
4. | The DCTs of many nephrons open into a straight tube called collecting duct. |
Assertion (A): | The filtrate gets concentrated as it moves down the descending limb of loop of Henle in the human nephron. |
Reason (R): | The descending limb of loop of Henle is impermeable to water but allows transport of electrolytes actively or passively. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): | The distal tubule plays a key role in regulating the potassium ion concentration in body fluids. |
Reason (R): | The distal tubule reabsorbs all potassium in the filtrate by active transport. |
In the light of the above statements choose the correct answer from the options given below:
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |