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Excretory System in Animals

Which structu...

Question

Which structure contains the lowest concentration of urea?

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Solution

The blood vessel leaving the kidney will have least concentration of urea. Because the urea is filtered out from blood in kidneys. So the blood vessel(,Renal) vein coming out from kidney will have least urea.

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Q. Which of the following parts of a kidney contains the lowest concentration of urea?

The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.

Parts indicated by the guidelines 1 to 8 are as follows :

1. Afferent arteriole from the renal artery;

2. Efferent arteriole

3. Bowman's capsule,

4. Glomerulus ;

5. Proximal convoluted tubule with blood capillaries;

6. Distal convoluted tubule with blood capillaries;

7. Collecting tubule;

8. U-shaped loop of Henle.

Study the diagram and answer the questions that follow;

(a) Where does ultrafiltration take place?

(b) Which structure contains the lowest concentration of urea?

(c) Which structure contains the highest concentration of urea?

(d) Which structure (normally) contains the lowest concentration of glucose?

(e) Where is most water reabsorbed?

Name the blood vessel that has the lowest concentration of urea.

What is the concentration of a solution which contains 16 g of urea in 120 g of solution?

Q. 255 g of an aqueous solution contains 5 g of urea. What is the concentration of the solution in terms of molality?
(Molar mass of urea = 60 g/mol)

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