Human Organ Systems (Digestive, Circulatory, Nervous, etc.) MCQs

1. Which organ system is responsible for transporting oxygen and nutrients throughout the body?
(A) Digestive system
(B) Circulatory system
(C) Respiratory system
(D) Nervous system

2. Which organ is the main control center of the nervous system?
(A) Heart
(B) Brain
(C) Liver
(D) Kidney

3. What is the main function of the digestive system?
(A) Circulate blood
(B) Exchange gases
(C) Break down food
(D) Control reflexes

4. Which blood vessels carry blood away from the heart?
(A) Veins
(B) Arteries
(C) Capillaries
(D) Venules

5. Which part of the digestive system is primarily responsible for nutrient absorption?
(A) Stomach
(B) Large intestine
(C) Esophagus
(D) Small intestine

6. The main function of the respiratory system is to:
(A) Digest food
(B) Produce hormones
(C) Exchange oxygen and carbon dioxide
(D) Filter blood

7. Which organ pumps blood throughout the body?
(A) Brain
(B) Lung
(C) Kidney
(D) Heart

8. The spinal cord is a part of which system?
(A) Circulatory system
(B) Digestive system
(C) Nervous system
(D) Endocrine system

9. The large intestine is mainly responsible for:
(A) Producing insulin
(B) Absorbing water and forming feces
(C) Breaking down proteins
(D) Absorbing nutrients

10. What type of muscle is found in the heart?
(A) Skeletal muscle
(B) Smooth muscle
(C) Cardiac muscle
(D) Voluntary muscle