This quiz works best with JavaScript enabled. Home > Science > Biology > Circulatory System – Quiz 103 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Circulatory System Quiz 103 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Clumping of particles which results when incompatible blood types are mixed within the body and the antibodies of one blood type react against the antigens of the other A) Agglutination. B) Antigens. C) Rh grouping system. D) Type A. E) Type A. Show Answer Correct Answer: A) Agglutination. 2. What keeps blood from flowing backwards in the heart? A) Atrium. B) Valves. C) Artery. D) None of above. Show Answer Correct Answer: B) Valves. 3. What type of blood vessel is the MOST muscular and elastic? A) Artery. B) Capillary. C) Vein. D) Venule. Show Answer Correct Answer: A) Artery. 4. How is water made in your body? A) When your blood forgets to carry it to your kidneys. B) When you drink too much. C) When it breaks down food. D) When you sleep too long. Show Answer Correct Answer: C) When it breaks down food. 5. The heart is a major organ in which body system? A) Respiratory. B) Circulatory. C) Excretory. D) Muscular. Show Answer Correct Answer: B) Circulatory. 6. The blood flowing from the lung to the heart has the most ....., A) Oxygen. B) Carbon dioxide. Show Answer Correct Answer: A) Oxygen. 7. Which blood vessel allows exchange of materials? A) Capillary. B) Artery. C) Vein. D) Arteriole. Show Answer Correct Answer: A) Capillary. 8. Which structure controls the flow of blood to your veins and keeps it flowing in one direction? A) Capillaries. B) Valves. C) Arteries. D) Veins. Show Answer Correct Answer: B) Valves. 9. Wall of the heart that lines all of the heart chambers and covers valves A) Pericardium. B) Epicardium. C) Myocardium. D) Endocardium. Show Answer Correct Answer: D) Endocardium. 10. Blood vessels that bring blood back to the heart are ..... A) Arteries. B) Blood pressure. C) Capillaries. D) Veins. Show Answer Correct Answer: D) Veins. 11. Tiny blood vessels surrounding the alveoli A) Capillaries. B) Alveoli. C) Cilia. D) Larynx. Show Answer Correct Answer: A) Capillaries. 12. Valves..... A) Prevent the back flow of blood. B) Separate sides of the heart. C) Carry oxygen. D) Fight infections. Show Answer Correct Answer: A) Prevent the back flow of blood. 13. Transpiration is a part of ..... ? A) Condensation. B) Sublimation. C) Evaporation. D) Precipitation. Show Answer Correct Answer: C) Evaporation. 14. The part of the blood responsible for fighting infection are the ..... A) Plasma. B) White blood cells. C) Red blood cells. D) Platelets. Show Answer Correct Answer: B) White blood cells. 15. The upper chambers of your heart are called ..... A) Atrium. B) Ventricle. C) Vestments. D) Artery. Show Answer Correct Answer: A) Atrium. 16. Raynaud syndrome is characterized by ..... of the arterioles of the extremities A) Vasodilation. B) Vasoconstriction. Show Answer Correct Answer: B) Vasoconstriction. 17. What is the composition of blood? A) 45% plasma, 55% cells. B) 60% plasma, 40% cells. C) 55% plasma, 45% cells. D) 50% plasma, 50% cells. Show Answer Correct Answer: C) 55% plasma, 45% cells. 18. What happens if the valves present in the heart do not function well? What happens when the valves in the heart don't work properly? A) Blood flows forward to ventricles well. B) Blood doesn't flow forward to ventricles. C) Blood doesn't flow backwards to atria. D) Blood flows backwards to atria. Blood flows backward into the atria. Show Answer Correct Answer: D) Blood flows backwards to atria. Blood flows backward into the atria. 19. ..... HELPS IN BLOOD CLOTTING. A) PLATELETS. B) RBCs. C) BLOOD CELLS. D) WBCs. Show Answer Correct Answer: A) PLATELETS. 20. Define what platelets do in the blood. A) Yellowish liquid that contains water, nutrients, salts and gases. B) Carry oxygen to the cells and carry carbon dioxide away. C) Attack invading microorganisms. D) Fragments of cells that help with blood clotting; they stop bleeding. Show Answer Correct Answer: D) Fragments of cells that help with blood clotting; they stop bleeding. ← 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