Maths Group11

Biology some questions about circulatory system from grade 9 unit 3. Choose the best answer from the given alternative! 1. What is the primary function of the circulatory system? A Transport oxygen and nutrients to cells B Produce hormones C Digest food D Control body temperature 2. Which blood vessel carries blood away from the heart? A Veins B Capillaries C Arteries D Lymph vessels 3. What type of blood does the pulmonary artery carry? A Oxygen-rich blood B Oxygen-poor blood C Nutrient-rich blood D Carbon dioxide-rich blood 4. Which chamber of the heart pumps oxygenated blood to the body? A Right atrium B Left atrium C Right ventricle D Left ventricle 5. What prevents the backflow of blood in the heart? A Valves B Arteries C Veins D Capillaries 6. What is the liquid component of blood called? A Plasma B Serum C Platelets D Hemoglobin 7. Which blood cells are responsible for carrying oxygen? A White blood cells B Red blood cells C Platelets D Plasma cells 8. Where does the exchange of gases occur between blood and body cells? A Arteries B Veins C Capillaries D Heart 9. What is the role of platelets in the circulatory system? A Fight infection B Carry oxygen C Help in blood clotting D Transport nutrients 10. Which blood vessel has the thinnest walls? A Arteries B Veins C Capillaries D Arterioles 11. What is the name of the largest artery in the body? A Pulmonary artery B Carotid artery C Aorta D Femoral artery 12. Which blood cells help fight infections? A Red blood cells B White blood cells C Platelets D Plasma 13. What causes the ‘lub-dub’ sound of the heartbeat? A Opening and closing of heart valves B Blood flowing through arteries C Contraction of muscles D Breathing movements 14. Which part of the heart receives deoxygenated blood from the body? A Left atrium B Right atrium C Left ventricle D Right ventricle 15. How does the circulatory system help regulate body temperature? A By producing sweat B By adjusting blood flow to the skin C By controlling breathing rate D By digesting food The end