Human and Social Biology Form 4

Form 4 HUMAN AND SOCIAL BIOLOGY Trinity    WEEK: May 18 to May 22

Teacher: Leon Abel                               Email: leonabel8@gmail.com

Circulatory System Part 2, The Heart – Answer ALL of the following questions:

1.     What happens to:

a.      the volume in the ventricles when the ventricles contract and the atria relax

b.     the pressure in the ventricles when the ventricles contract and the atria relax

2.     What is the role of the:

a.      Bicuspid valves

b.     Tricuspid valves

3.     What is the role of the semi-lunar valves?

4.     Suggest why the left ventricle of the heart is thicker than the right ventricle.

5.     Suggest why the walls of the atria are much thinner than those of the ventricles.

6.     What type of blood vessel is:

a.      the aorta

b.     the vena cava

7.     What term is used for the:

a.      contraction of heart (cardiac) muscle

b.     the relaxation of heart (cardiac) muscle