THE CIRCULATORY SYSTEM

ACTIVITY

Qn a) Discuss the ways hook worms enter our bodies.

1. b) Discuss the ways hook worms can be controlled.
2. Qn a) Write down at least 5 examples of PIASCY messages in your school.
   1. b) How do PIASCY messages help to control the spread of HIV among the youths and

               teenagers?

3. Qn. Why is Sir William Harvey still remembered in Science?
4. Qn. Why is blood first screened thoroughly before it is donated by an individual?Qn. Why is blood first screened thoroughly before it is transfused to a patient?
5. Qn. Apart from waste materials, give at least 3 other materials that are       transported by plasma in the body.
6. Qn. How do white blood cells fight germs in the body? (Give 3)
7. Qn. a) Of what importance are valves in the hear?
8. b) How is the function of the valves similar to that of a constriction in the         clinical thermometer?
9. c) How do valves prevent the back flow of blood in the veins and the heart?
10. Qn a) Name the vein that transports oxygenated blood in the body.
11. b) What is the use of valves in veins?
12. Qn a)  Name the artery that carries deoxygenated blood in the body.
    b) Why do arteries have thick walls?
13. c) Why is it that blood cannot back flow in arteries and yet they have no valves?
14. Qn. State the function of blood vessels in the body.