Question

The diagram alongside shows a mammalian kidney tube (nephron), [5 MARKS]
(i) On the diagram name the parts A, C, D and E.
(ii) What effect does the difference in the diameter of tubes D and E have on blood pressure?
(iii) State three differences in the composition of the fluid contained in the regions C and E.

Answer 1

i) 2 Marks
ii) 1 Mark
iii) 2 Marks

(i)
A - Proximal convoluted tubule
C - Bowman's capsule
D - Afferent arteriole
E - Efferent arteriole

(ii) The blood pressure increases resulting in ultrafiltration by which a large quantity of the liquid part of the blood is forced out of the glomerulus into the nephron.

(iii)

Region C	Region E
1. Contains more water.	1. Contains less water.
2. Contains more urea.	2. Contains less urea.
3. Contains more salts and sugars.	3. Contains less salts and sugar.
4. Contains no blood corpuscles.	4. Contains blood corpuscles.