1. Which system controls and coordinates all activities of the body?
A) Digestive system
B) Respiratory system
C) Nervous system
D) Circulatory system
Answer: C) Nervous system
2. The main organ of the circulatory system is:
A) Lung
B) Heart
C) Kidney
D) Liver
Answer: B) Heart
3. Which system is responsible for the exchange of gases?
A) Digestive system
B) Respiratory system
C) Skeletal system
D) Endocrine system
Answer: B) Respiratory system
4. The basic structural unit of the nervous system is:
A) Nephron
B) Neuron
C) Alveolus
D) Osteon
Answer: B) Neuron
5. Which organ is primarily involved in digestion of food?
A) Stomach
B) Heart
C) Lung
D) Brain
Answer: A) Stomach
6. The skeletal system is mainly responsible for:
A) Pumping blood
B) Protecting organs
C) Producing hormones
D) Filtering waste
Answer: B) Protecting organs
7. Which system removes waste products from the blood?
A) Digestive system
B) Excretory system
C) Respiratory system
D) Muscular system
Answer: B) Excretory system
8. The functional unit of the kidney is:
A) Alveolus
B) Nephron
C) Villus
D) Axon
Answer: B) Nephron
9. Which system helps in body movement?
A) Muscular system
B) Endocrine system
C) Lymphatic system
D) Nervous system
Answer: A) Muscular system
10. Hormones are secreted by which system?
A) Nervous system
B) Endocrine system
C) Digestive system
D) Skeletal system
Answer: B) Endocrine system
11. Which part of the respiratory system contains alveoli?
A) Trachea
B) Bronchi
C) Lungs
D) Diaphragm
Answer: C) Lungs
12. Blood is filtered in which organ?
A) Liver
B) Kidney
C) Heart
D) Stomach
Answer: B) Kidney
13. The largest organ of the human body is:
A) Brain
B) Liver
C) Skin
D) Heart
Answer: C) Skin
14. The immune system mainly protects the body from:
A) Injury
B) Infections
C) Hunger
D) Dehydration
Answer: B) Infections
15. The small intestine is part of which system?
A) Circulatory system
B) Digestive system
C) Nervous system
D) Skeletal system
Answer: B) Digestive system
16. The brain and spinal cord form the:
A) Peripheral nervous system
B) Central nervous system
C) Endocrine system
D) Lymphatic system
Answer: B) Central nervous system
17. Which blood vessels carry blood away from the heart?
A) Veins
B) Capillaries
C) Arteries
D) Nephrons
Answer: C) Arteries
18. Oxygen is transported in the blood by:
A) Plasma
B) Platelets
C) Hemoglobin
D) Hormones
Answer: C) Hemoglobin
19. Which system produces gametes (sex cells)?
A) Reproductive system
B) Digestive system
C) Respiratory system
D) Skeletal system
Answer: A) Reproductive system
20. The diaphragm helps in:
A) Digestion
B) Circulation
C) Breathing
D) Excretion
Answer: C) Breathing
21. The liver is mainly involved in:
A) Pumping blood
B) Producing insulin
C) Detoxifying chemicals
D) Sending impulses
Answer: C) Detoxifying chemicals
22. Which system maintains body posture and support?
A) Muscular system
B) Skeletal system
C) Nervous system
D) Endocrine system
Answer: B) Skeletal system
23. Insulin is produced by the:
A) Thyroid gland
B) Adrenal gland
C) Pancreas
D) Pituitary gland
Answer: C) Pancreas
24. The spinal cord is protected by:
A) Skull
B) Rib cage
C) Vertebral column
D) Pelvis
Answer: C) Vertebral column
25. White blood cells are important for:
A) Carrying oxygen
B) Blood clotting
C) Fighting infection
D) Digestion
Answer: C) Fighting infection
26. Which organ stores bile?
A) Liver
B) Gallbladder
C) Pancreas
D) Kidney
Answer: B) Gallbladder
27. The pulse is caused by the pumping of the:
A) Lungs
B) Brain
C) Heart
D) Kidney
Answer: C) Heart
28. The thyroid gland controls:
A) Digestion
B) Growth and metabolism
C) Blood pressure
D) Breathing rate
Answer: B) Growth and metabolism
29. Sweat glands are part of which system?
A) Digestive system
B) Integumentary system
C) Circulatory system
D) Nervous system
Answer: B) Integumentary system
30. The main function of red blood cells is to:
A) Fight infection
B) Carry oxygen
C) Produce hormones
D) Control movement
Answer: B) Carry oxygen