Human Body Systems and Their Functions MCQs 10 Score: 0 Attempted: 0/20 1. Which system of the human body is responsible for transporting oxygen and nutrients? (A) Nervous system (B) Respiratory system (C) Circulatory system (D) Digestive system 2. What is the main function of the respiratory system? (A) Pumping blood (B) Exchanging gases (oxygen and carbon dioxide) (C) Breaking down food (D) Regulating body temperature 3. Which organ is the control center of the nervous system? (A) Heart (B) Lungs (C) Brain (D) Liver 4. The skeletal system primarily provides: (A) Digestion of food (B) Structural support and protection (C) Blood circulation (D) Hormone regulation 5. The muscular system works closely with which system to allow movement? (A) Endocrine system (B) Nervous system (C) Digestive system (D) Circulatory system 6. Which system is responsible for breaking down food and absorbing nutrients? (A) Respiratory system (B) Digestive system (C) Nervous system (D) Skeletal system 7. The kidneys are part of which body system? (A) Respiratory system (B) Circulatory system (C) Urinary (Excretory) system (D) Muscular system 8. What is the function of the endocrine system? (A) Controlling voluntary movements (B) Transporting oxygen (C) Producing hormones for body regulation (D) Breaking down food 9. The largest organ of the human body is: (A) Liver (B) Brain (C) Skin (D) Heart 10. Which system defends the body against infections and diseases? (A) Endocrine system (B) Immune system (C) Digestive system (D) Nervous system 11. The primary function of the lymphatic system is to: (A) Transport nutrients (B) Regulate body temperature (C) Maintain fluid balance and fight infections (D) Control breathing 12. Which body system is responsible for producing red blood cells? (A) Skeletal system (B) Muscular system (C) Endocrine system (D) Circulatory system 13. What part of the body is mainly responsible for filtering toxins from the blood? (A) Heart (B) Liver (C) Stomach (D) Pancreas 14. The main organ of the circulatory system is: (A) Brain (B) Lungs (C) Heart (D) Kidneys 15. The function of the reproductive system is to: (A) Protect the body from diseases (B) Support body movement (C) Ensure survival of the species (D) Transport oxygen and nutrients 16. What is the function of the nervous system? (A) Controlling body activities and responding to stimuli (B) Producing hormones (C) Filtering blood (D) Breaking down food 17. Which system includes the lungs and helps in breathing? (A) Circulatory system (B) Digestive system (C) Respiratory system (D) Nervous system 18. The pancreas is a part of which two systems? (A) Circulatory and Muscular (B) Digestive and Endocrine (C) Skeletal and Immune (D) Urinary and Respiratory 19. Which system helps in controlling body temperature, sweating, and protecting internal organs? (A) Nervous system (B) Skeletal system (C) Integumentary system (D) Respiratory system 20. The small intestine is the main site for: (A) Oxygen exchange (B) Food digestion and nutrient absorption (C) Blood circulation (D) Hormone production