A series of straight capillaries in the medulla that lie parallel to the loop of Henle are called:

1. arcuate arteries 2. efferent arterioles
3. afferent arterioles 4. vasa recta

Subtopic:  Human Kidney: Location & Cut Section | Nephron Part 1 | Nephron Part 2 |
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About what percent of the glomerular ultrafiltrate is reabsorbed by the tubules during urine formation?

1. 99% 2. 70%
3. 50% 4. 20%
Subtopic:  Formation of Urine |
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10 to 15 distinct conical or triangular structures in the human kidney are seen in renal ______ and are known as renal ____________.

1. pelvis; calyces 2. medulla; pyramids
3. cortex; columns of Bertini 4. cortex; lobes
Subtopic:  Human Kidney: Functions | Human Kidney: Location & Cut Section |
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All of the following regarding juxtamedullary nephrons in human kidneys are correct except:

1. the entire nephron is located in the superficial cortex of the kidney

2. the renal corpuscle comprises a glomerulus and a glomerular capsule

3. blood arrives at the glomerular capillaries via an afferent arteriole

4. the proximal convoluted tubule leads into a long nephron loop

Subtopic:  Human Kidney: Functions |
 73%
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The part of the nephron where both hydrogen and potassium ions are secreted into the tubular fluid is the

1. Malpighian body 2. proximal convoluted tubule
3. loop of Henle 4. distal convoluted tubule
Subtopic:  Nephron Part 1 | Nephron Part 2 | Formation of Urine |
 51%
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Specialized smooth muscle cells mainly in the walls of the afferent arterioles called the Juxtaglomerular cells secrete:

1. ADH 2. angiotensin
3. aldosterone 4. renin
Subtopic:  Formation of Urine |
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The hormone produced by the adrenal cortex, when stimulated by angiotensin II, that causes increased sodium and water reabsorption in the distal convoluted tubules, is:

1. renin 2. aldosterone
3. antidiuretic hormone 4. cortisol
Subtopic:  Autoregulation of GFR |
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Refer the given figure of nephron.

Identify A, B, C, and D and select the correct option regarding them.
1. A - Glomerulus - a tuft of capillaries formed by afferent arteriole.
2. B - PCT- reabsorption of \(HCO^-_3\) and selective secretion of H+ and K+ occurs here.
3. C - DCT- almost all glucose, amino acids, water, Na+, K+, and uric acid are absorbed here.
4. D - collecting duct - extends from the cortex of the kidney to the inner parts of the medulla; a large amount of water is secreted in this region.
Subtopic:  Nephron Part 1 | Nephron Part 2 | Formation of Urine | Disorders of Excretory System |
 64%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 

Assertion (A): Many amphibians excrete mainly ammonia when they are aquatic tadpoles and switch largely to urea excretion when they become land dwelling adults.
Reason (R): The main disadvantage of urea is its energy cost and the main advantage is its low toxicity.


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.

Subtopic:  Nitrogenous Excretory Products |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 

Assertion (A): Excreting uric acid in birds and reptiles with shelled eggs conveys a selective advantage.
Reason (R): Uric acid is more energetically expensive than urea.


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.

Subtopic:  Nitrogenous Excretory Products |
 56%

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