This quiz works best with JavaScript enabled. Home > Science > Biology > Circulatory System – Quiz 67 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Circulatory System Quiz 67 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The heart's protective membrane filled with fluid to reduce friction is called..... A) Cardinal. B) Pericardium. C) Triskuspidalis. D) Semilunar. Show Answer Correct Answer: B) Pericardium. 2. Where does the oxygen-rich blood from the lungs go after it returns to the heart? A) It is pumped back to the lungs. B) It is pumped out into the body through the aorta. C) It stays in the heart. D) It is pumped to the right side of the heart. Show Answer Correct Answer: B) It is pumped out into the body through the aorta. 3. How can we keep our heart healthy? A) Be stress-free. B) Stay away from unhealthy fats. C) Get good sleep. D) All are good options to keep heart healthy. Show Answer Correct Answer: D) All are good options to keep heart healthy. 4. Why does someone feel fine then fall dead from a heart attack? A) Because they are old. B) Because their arteries are narrow. C) Because their arteries are narrow and blood clots lodge in them. D) Because their dont eat right. Show Answer Correct Answer: C) Because their arteries are narrow and blood clots lodge in them. 5. Which organ of the circulatory system is the place where arteries and veins meet? A) Capillaries. B) Veins. C) Arteries. D) Heart. Show Answer Correct Answer: A) Capillaries. 6. What does an electrocardiogram show? A) Blood pressure. B) Pulse rate. C) Lymphatic drainage. D) Electrical activity of the heart. Show Answer Correct Answer: D) Electrical activity of the heart. 7. Which of the following makes up 55% of the blood? A) Blood Platelets. B) Erythrocytes. C) Blood Plasma. D) None of above. Show Answer Correct Answer: C) Blood Plasma. 8. What is the function of mitochondria? A) Food is digested. B) Where cellular respiration takes place. C) To provide protection. D) To clean the cell. Show Answer Correct Answer: B) Where cellular respiration takes place. 9. Which is the correct sequence of blood flow through the heart and lungs? A) Left ventricle, left atrium, lungs, right ventricle, right atrium. B) Right atrium, right ventricle, lungs, left atrium left ventricle. C) Lungs, right atrium, right ventricle, left atrium, left ventricle. D) Right atrium, right ventricle, left atrium, left ventricle, lungs. Show Answer Correct Answer: B) Right atrium, right ventricle, lungs, left atrium left ventricle. 10. The large artery that brings blood from the heart to the lungs is called the A) Pulmonary artery. B) Capillary. C) Vein. D) Ventricle. Show Answer Correct Answer: A) Pulmonary artery. 11. Large amounts of stomata on the lower surface of leaves rather than upper surface will result in ..... A) High rate of transpiration. B) Low rate of transpiration. C) Irregular rate of transpiration. D) High rate of transpiration at night. Show Answer Correct Answer: B) Low rate of transpiration. 12. What is chemical digestion A) Acid and enzymes breaking down food. B) Physically breaking food into smaller pieces increasing the surface area of the food. C) The chewing motion of breaking down food. D) Chemical reaction using enzymes to break down polymer into monomers. Show Answer Correct Answer: D) Chemical reaction using enzymes to break down polymer into monomers. 13. Fights infections and diseases A) Red blood cell. B) White blood cell. C) Platelets. D) Plasma. Show Answer Correct Answer: B) White blood cell. 14. Which of these is not a layer of the heart? A) Pericardium. B) Epicardium. C) Myocardium. D) Endocardium. Show Answer Correct Answer: A) Pericardium. 15. Common illnesses that affect the circulatory system include arteriosclerosis, demage in the heart or blood vessels, HYPERTENSION, anaemia and LEUKAEMIA. A) True. B) False. Show Answer Correct Answer: A) True. 16. What blood vessels carry blood back to the heart? A) Veins. B) Xylem. C) Neurons. D) Arteries. Show Answer Correct Answer: A) Veins. 17. Which type of vessel has the largest lumen? A) Vein. B) Arteriole. C) Artery. D) Capillary. Show Answer Correct Answer: A) Vein. 18. Carbon dioxide rich blood enters the heart through what chamber? A) Right Atrium. B) Left Atrium. C) Right Ventricle. D) Left Ventricle. Show Answer Correct Answer: A) Right Atrium. 19. What is the function of the white blood cells? A) To carry oxygen and carbon dioxide. B) To help with blood clotting. C) To fight infections, parasites and bacteria. D) To filter air. Show Answer Correct Answer: C) To fight infections, parasites and bacteria. 20. Cardiac output increases during exercise. A) True. B) False. Show Answer Correct Answer: A) True. ← 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