Circulatory System Test PDF

1. What is the main function of the circulatory system? A. To digest food. B. To transport blood, nutrients, and oxygen. C. To store oxygen in the body. D. To produce red blood cells. ANSWER: B 2. Which part of the circulatory system acts as the central pump? A. Arteries B. Veins C. Heart D. Plasma...

1. What is the main function of the circulatory system? A. To digest food. B. To transport blood, nutrients, and oxygen. C. To store oxygen in the body. D. To produce red blood cells. ANSWER: B 2. Which part of the circulatory system acts as the central pump? A. Arteries B. Veins C. Heart D. Plasma ANSWER: C 3. What type of blood vessel carries oxygen-rich blood away from the heart? A. Veins B. Capillaries C. Arteries D. Plasma ANSWER: C 4. What is the largest artery in the body? A. Pulmonary artery B. Carotid artery C. Aorta D. Femoral artery ANSWER: C 5. What feature of veins prevents blood from flowing backward? A. Thick walls B. Valves C. Capillaries D. Smooth muscle ANSWER: B 6. What are the smallest blood vessels called? A. Arteries B. Veins C. Capillaries D. Plasma ANSWER: C 7. What do red blood cells transport to the body’s tissues? A. Nutrients B. Oxygen C. Carbon dioxide D. Platelets ANSWER: B 8. Which blood cells defend the body by attacking bacteria? A. Red blood cells B. Platelets C. White blood cells D. Plasma cells ANSWER: C 9. What is the role of platelets in the circulatory system? A. Transport oxygen to cells. B. Attack bacteria and infections. C. Form clots to stop bleeding. D. Carry carbon dioxide. ANSWER: C 10. What is the watery component of blood called? A. Red blood cells B. Plasma C. Platelets D. Hemoglobin ANSWER: B... (remaining questions are truncated for brevity)