Which of the following is true for excretion in humans?

1. Glucose and amino acids are reabsorbed in PCT by simple diffusion.

2. DCT is permeable to water.

3. On average, 25-30 gm of urea is excreted out per day.

4. Maximum reabsorption occurs in the loop of Henle.

Subtopic:  Micturition Reflex |
 79%
From NCERT
AIIMS - 2013
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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- A tuft of capillaries formed by afferent arteriole.
2. B-PCT-reabsorption of HCO3- 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 medulla. Large amount of water is secreted in this region.

Subtopic:  Nephron Part 2 |
 74%
From NCERT
AIIMS - 2014
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Which part of the nephrons is impermeable to water?
1. Proximal convoluted tubule
2. Distal convoluted tubule
3. Ascending limb of loop of Henle
4. Descending limb of loop of Henle

Subtopic:  Formation of Urine |
 83%
From NCERT
AIIMS - 2015
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When kidney of a person is damaged, he/she invariably suffers fom anaemia because

(1) RBCs pass through the glomerulus

(2) Sufficient erythropoietin is not produced

(3) haemoglobin is not synthesised sufficiently

(4) Iron and viatmin B-12 are not able to bind to haemoglobin.

Subtopic:  Human Kidney: Functions |
 65%
AIIMS - 2015
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Which of the following process of urine formation takes place all along the renal tubule and collecting duct?

1. Ultrafiltration and tubular reabsorption

2. Ultrafiltration and tubular secretion

3. Tubular reabsorption and secretion

4. Anti-current mechanism and reabsorption

Subtopic:  Formation of Urine |
 61%
From NCERT
AIIMS - 2017
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In man, in which part of the uriniferous tubule reabsorpton of glucose occurs?
(1) Collecting tube

(2) Henle's loop

(3) Distal convoluted tubule

(4) Proximal convoluted tubule

Subtopic:  Formation of Urine |
 79%
AIIMS - 2016
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What is true of urea biosynthesis?

(1) Uric acid is starting point

(2) Urea is synthesised in lysosomes

(3) Urea cycle enzymes are located inside mitochondria

(4) Urea is synthesised in kidney

Subtopic:  Nitrogenous Excretory Products |
 55%
AIIMS - 2015
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Assertion   :       Ammonia should be eliminated from the body as rapidly as it is formed.

Reason      :       Ammonia is insoluble in water.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Nitrogenous Excretory Products |
 65%
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Assertion   :       Urinary bladder and ureters are lined by transitional epithelium.

Reason      :       Ureters carry the urine to urinary bladder where it is stored temporarily.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Micturition Reflex |
 71%
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Assertion   :       In vertebrates, the liver is also referred as an accessory excretory organ.

Reason      :       Liver helps kidneys in the secretion of urine.
1.  Both A & R are true and the R is the correct explanation of the A.
2.  Both A & R are true but the R is not the correct explanation of the A.
3.  A is true statement but R is false.
4.  Both A and R are false statements.

Subtopic:  Role of other Organs in Excretion |
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