Health Science practice questions with answers

Health Science practice questions with answers
13th edition edited by Brian.m.Mugo 2025-2026
1. What is homeostasis?
Answer: Maintenance of a stable internal body environment.
2. What is the basic unit of life?
Answer: The cell.
3. Which organ pumps blood?
Answer: The heart.
4. What is the main function of red blood cells?
Answer: Carry oxygen.
5. What do white blood cells do?
Answer: Fight infection.
6. What is hypertension?
Answer: High blood pressure.
7. What is hypotension?
Answer: Low blood pressure.
8. What is the normal body temperature?
Answer: 37°C (98.6°F).
9. What organ filters blood?
Answer: The kidneys.

, 10. What is dehydration?
Answer: Lack of enough body fluids.


11. What is the largest organ?
Answer: Skin.
12. What system controls the body?
Answer: Nervous system.
13. What is the skeletal system made of?
Answer: Bones.
14. What is the function of lungs?
Answer: Gas exchange (oxygen and carbon dioxide).
15. What is digestion?
Answer: Breakdown of food into nutrients.
16. What is metabolism?
Answer: Chemical processes in the body that maintain life.
17. What is immunity?
Answer: Ability to resist disease.
18. What is a pathogen?
Answer: Disease-causing organism.
19. What is a virus?