Human And Social Bilogy

QUESTIONS FOR CXC STUDENTS

1. What is the name of the substance which is formed when oxygen combines with haemoglobin? Oxyhaemoglobin 2. What is another name for white blood cells? Leucocytes 3. Plasma

What is the name of the liquid part of the blood?

4. Which white blood cells contain a granular cytoplasm? Phagocytes 5. What is the function of phagocytes? engulf bacteria 6. Which white blood cells make antibodies? Lymphocytes 7. In which organ is white blood cells made? bone marrow/spleen/lymph nodes 8. 90%

What percent of water is present in plasma?

9. Which protein is released from platelets when the skin is cut? Thromboplastin 10. Which salt is required during the conversion of prothrombin to thrombin? Calcium 11. To which substance is fibrinogen converted during the formation of a blood clot? Fibrin 12. In which organ is prothrombin made? Liver 13. Which vitamin is essential in the production of prothrombin? Vitamin K 14. Which part of the blood transports carbon dioxide? Plasma 15. Which blood vessels carry blood away from the heart? Arteries 16. Which blood vessels carry blood towards the heart? Veins 17. Why do arteries have thick walls? they have to stand blood of a high pressure 18.

What are the names of the smaller vessels into which arteries branch?

Arterioles 19. What are the structures present in veins called? Valves 20. Which structures prevent the flow of blood in the wrong direction? Valves The Skeletal System 21. Which skeleton is made up of the skull and the vertebral column axial skeleton