K.C.S.E Biology Q & A - MODEL 2004PP1QN13

K.C.S.E Biology Q & A - MODEL 2004PP1QN13

The diagram below shows a vertical section through a mammalian heart.

​a) Name the parts labeled A,B,E and F 
b) Use arrows to show the direction in which blood flows in the heart.
c) Give a reason why the wall of chamber C is thicker than chamber D 

answers

(a) A Pulmonary vein
B Left atrium I auricle
E Tricuspid valve
F Pulmonary artery

​(b) The left ventricle ‘C’ pumps blood a longer distance to all parts of the body; while the right  ventricle ‘D’ pumps blood to a shorter distance/ to the lungs; therefore the left ventricle has thicker walls to generate exert more pressure.