This quiz works best with JavaScript enabled. Home > Science > Biology > Circulatory System – Quiz 462 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Circulatory System Quiz 462 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the role of myoglobin? A) Reduce affinity for oxygen. B) To carry four molecules of oxygen. C) To allow aerobic respiration to continue for longer. D) None of above. Show Answer Correct Answer: C) To allow aerobic respiration to continue for longer. 2. What does the spleen do? A) Produces antibodies to target bacteria. B) Nothing. C) Produces lymphocytes, stores blood cells, and destroys old blood cells. D) Removes toxins and bacteria. Show Answer Correct Answer: C) Produces lymphocytes, stores blood cells, and destroys old blood cells. 3. What are the substances that is carried by circulatory system? A) Blood. B) Haemolymph. C) Oxygen. D) Lipase. Show Answer Correct Answer: C) Oxygen. 4. The heart is the size of a large fist. A) True. B) False. Show Answer Correct Answer: A) True. 5. The process of breakdown of old and worn out RBCs is known as ..... A) Leveling. B) Haemolysis. C) Erythropenia. D) Bilirubin. Show Answer Correct Answer: B) Haemolysis. 6. The upper chamber A) Ventricles. B) Atriums. C) Blood. D) No correct answer. Show Answer Correct Answer: B) Atriums. 7. The tricuspid valve prevents the backflow of blood from the ..... and the ..... A) Right atrium, right ventricle. B) Left atrium, right atrium. C) Right ventricle, left ventricle. D) Left atrium, left ventricle. Show Answer Correct Answer: A) Right atrium, right ventricle. 8. ..... plays a major role in blood clotting. A) Platelets. B) Ventricles. C) Aorta. D) Capillaries. Show Answer Correct Answer: A) Platelets. 9. These vessels carry oxygenated blood and are no thicker than a hair. A) Arterioles. B) Capillaries. C) Aorta. D) None of above. Show Answer Correct Answer: A) Arterioles. 10. It is needed to keep us alive. It brings oxygen and nutrients to all the parts of the body so they can keep working. A) Blood. B) Water. C) Air. D) None of above. Show Answer Correct Answer: A) Blood. 11. What side of the heart are the ventricle? A) The upper side. B) The lower side. C) The right side. D) The left side. Show Answer Correct Answer: B) The lower side. 12. Blood cells that fight infections caused by parasites. A) Eosinophil. B) Monocytes. C) Basphil. D) Neutrophil. Show Answer Correct Answer: A) Eosinophil. 13. The valves allow the flow of blood in A) One direction only. B) Both direction s. C) Multiple directions. D) None. Show Answer Correct Answer: A) One direction only. 14. I am part of the immune system that searches for infection so I can engulf and destroy bacteria that might try to harm you. A) White blood cells. B) Red blood cells. C) Plasma. D) Platelets. Show Answer Correct Answer: A) White blood cells. 15. Arteries branch into smaller and smaller blood vessels, eventually so small that they can reach every cell in the body A) TRUE. B) FALSE. Show Answer Correct Answer: A) TRUE. 16. The systemic circulation provides the ....., ..... and ..... with blood A) Organs, tissues and cells. B) Lungs, heart, and brain. C) Ears, nose and throat. D) Veins, arteries and capillaries. Show Answer Correct Answer: A) Organs, tissues and cells. 17. The pulmonary arteries and veins bring blood to and from the A) Lower body. B) Upper body. C) Lungs. D) Heart. Show Answer Correct Answer: C) Lungs. 18. Upper chambers of the heart that receive blood entering the heart A) Atria. B) Ventricles. C) Arteries. D) Veins. Show Answer Correct Answer: A) Atria. 19. During a biology class, Abigail, Arjun, and Ethan were discussing which muscle works the hardest in the human body. Which muscle were they referring to? A) Bicep muscle. B) Quadriceps muscles. C) Heart muscle. D) Abdominal muscle. Show Answer Correct Answer: C) Heart muscle. 20. Which blood vessel has the "lowest" blood pressure? A) Capillaries. B) Pulmonary vein. C) Coronary artery. D) Vena cava. Show Answer Correct Answer: D) Vena cava. ← PreviousNext →Related QuizzesScience QuizzesCirculatory System Quiz 1Circulatory System Quiz 2Circulatory System Quiz 3Circulatory System Quiz 4Circulatory System Quiz 5Circulatory System Quiz 6Circulatory System Quiz 7Circulatory System Quiz 8Circulatory System Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books