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
(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.