Question

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

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

1. Afferent arteriole from 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 question that follow:

Which structure contains the lowest concentration of urea?

Answer 1

2/Efferent arteriole