Excretory Products and their Elimination Test 34

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Excretory Products and their Elimination Test 34

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Question 1
1 / -0

How many molecules of ammonia are required to form 8 molecules of urea?

A
24

B
8

C
16

D
4

Solution

Urea synthesis is a five-step cyclic process, with five distinctive enzymes. One turn of the cycle consumes 2 molecules of ammonia and 1 molecule of carbon dioxide and creates 1 molecule of urea ((NH2)2CO. Hence 16 molecules of ammonia are required to form 8 molecules of urea.
So, the correct answer is 'Option C'.
Question 2
1 / -0

Which is not part of renal pyramid

A
Collecting ducts

B
Loop of Henle

C
Convoluted tubules

D
Peritubular capillaries
Solution
- The medulla is divided into a few conical masses called medullary pyramids projecting into the calyces.
- The cortex extends in between the medullary pyramids as renal columns called Columns of Bertini. Hence convoluted tubules are not a part of the renal tubule.
So, the correct answer is 'Convoluted tubules'.
Question 3
1 / -0

Connecting tubule acts as part of which organ

A
Heart

B
Kidney

C
Liver

D
Pancreas

Solution

Renal collecting tubule is also called as ducts of Bellini. The most distal portion of collecting duct is called as ducts of Bellini. They receive renal filtrate from several collecting ducts and open into the minor calyx. Hence Collecting tubule acts as a part of the Kidney.
So, the correct answer is 'Kidney'.
Question 4
1 / -0

Ducts of Bellini open in

A
Minor calyx

B
Major calyx

C
Renal pyramid

D
Renal sinus

Solution

The most distal portion of collecting duct is called as ducts of Bellini. They receive renal filtrate from several collecting ducts and open into the minor calyx.
So, the correct answer is 'Minor calyx'.
Question 5
1 / -0

Which is correctly matched

A
Man - Ureotelic

B
Bird - Ammonotelic

C
Fish Uricotelic

D
Frog - Uricotelic

Solution

The composition of urine in man is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic.
So, the correct answer is 'Option A'.
Question 6
1 / -0

Average quantity of urea excreted daily humans per day is

A
10 - 15 g

B
25 - 30 g

C
40 - 50 g

D
100 - 500 mg

Solution

The composition of urine in humans is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic., On an average, 25-30 g of urea is excreted out per day.
So, the correct answer is '25-30 g'.
Question 7
1 / -0

lonosnic pathway occurs in

A
Ammonotelism

B
Uricotelism

C
Ureotelism

D
Guanotelism

Solution

The Ionosinic pathway is the pathway that involves the synthesis of inosine acid or inosine monophosphate (IMP). It is the first nucleotide formed (as an intermediate) during the synthesis of purine. In the liver, ammonia combines with carbon dioxide and ATP to form urea. Urea synthesis is a five-step cyclic process. Adenosine monophosphate id formed from ATP during urea cycle. IMP is formed by deamination of AMP. Hence Ionosnic pathway occurs in ureotelism.
So, the correct answer is 'Ureotelism'.
Question 8
1 / -0

Column of Bertin is extension of

A
Cortex into medulla

B
Medulla into cortex

C
Renal pelvis into renal, sinus

D
Renal-capsule into cortex

Solution

The cortex extends in between the medullary pyramids as renal columns called Columns of Bertini. Hence Columns of Bertin is the extension of cortex into the medulla. Each column consists of lines of blood vessels and urinary tubes.
So, the correct answer is 'Option A'.
Question 9
1 / -0

Select the correct statement

A
Juxtamedullary nephrons have reduced Henles loop

B
Vasa recta is well developed in cortical nephrons

C
Ascending limb of Henle's loop extends as DCT

D
Glomerulus encloses Bowmans capsule

Solution

The nephron is the structural and functional unit of the kidney. Its body is divided into Bowman's capsule, proximal convoluted tubule(DCT), Helen's loop, and distal convoluted tubule(DCT). Henle's loop is hairpin shaped part of nephron which has descending limb and ascending limb. The ascending limb of Henle's loop ascending limb extends as DCT.
So, the correct answer is 'Ascending limb of Henle's loop extends as DCT'.
Question 10
1 / -0

Which one of the following statements in regard to the excretion by the human kidneys is correct ?

A
Distal convoluted tubule is incapable reabsorbing $$HCO_3$$

B
Nearly 99% of glomerular filtrate is reabsorbed by renal tubules

C
Ascending limb of loop of Henle in impermeable to electrolytes

D
Descending limb of loop of Henle, impermeable to water
Solution
Correct Option: B
Explanation:
The process by which the kidneys filter the blood, eliminating excess wastes and fluids is termed Glomerular filtration. A comparison of the degree of filtrate shaped per day (180 liters) with water discharged(1.5 liters) suggests that just about 99% of the filtrate is reabsorbed by urinary vessels (renal tubules).
The distal convoluted tube is incapable of reabsorbing Na+ ions.
The ascending limb of Henle's loop is water-repellent(impermeable) to water.
The downward(descending) limb of the loop of Henle is leaky to water. Hence, nearly 99% of glomerular filtrate is reabsorbed by renal tubes is the correct statement among all.

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Excretory Products and their Elimination Test 34

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Excretory Products and their Elimination Test 34

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SHARING IS CARING

Question 1

24

8

16

4

Solution

Question 2

Collecting ducts

Loop of Henle

Convoluted tubules

Peritubular capillaries

Solution

Question 3

Heart

Kidney

Liver

Pancreas

Solution

Question 4

Minor calyx

Major calyx

Renal pyramid

Renal sinus

Solution

Question 5

Man - Ureotelic

Bird - Ammonotelic

Fish Uricotelic

Frog - Uricotelic

Solution

Question 6

10 - 15 g

25 - 30 g

40 - 50 g

100 - 500 mg

Solution

Question 7

Ammonotelism

Uricotelism

Ureotelism

Guanotelism

Solution

Question 8

Cortex into medulla

Medulla into cortex

Renal pelvis into renal, sinus

Renal-capsule into cortex

Solution

Question 9

Juxtamedullary nephrons have reduced Henles loop

Vasa recta is well developed in cortical nephrons

Ascending limb of Henle's loop extends as DCT

Glomerulus encloses Bowmans capsule

Solution

Question 10

Distal convoluted tubule is incapable reabsorbing $$HCO_3$$

Nearly 99% of glomerular filtrate is reabsorbed by renal tubules

Ascending limb of loop of Henle in impermeable to electrolytes

Descending limb of loop of Henle, impermeable to water

Solution

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