This quiz works best with JavaScript enabled. Home > Science > Biology > Circulatory System – Quiz 454 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Circulatory System Quiz 454 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If a blood clot prevents blood from reaching the brain, we call this a ..... A) Stroke. B) Heart attack. C) Tumor. D) Hernia. Show Answer Correct Answer: A) Stroke. 2. What is a normal heart rate in adults? A) 100 bpm. B) < 50 bpm. C) 70 bpm. D) 4-6 bpm. Show Answer Correct Answer: C) 70 bpm. 3. What prevents backflow of blood inside the heart during contraction? A) Valves in heart. B) Thick muscular walls of ventricles. C) Thick walls of atria. D) All of these. Show Answer Correct Answer: A) Valves in heart. 4. It is known as the largest artery in the body. A) Superior vena cava. B) Inferior vena cava. C) Aorta. D) Both a and b. Show Answer Correct Answer: C) Aorta. 5. Sclerosis A) Soft. B) Hardening. C) Heart. D) Red. Show Answer Correct Answer: B) Hardening. 6. Blood is described as a liquid tissue that performs which of the following functions? A) Transports nutrients to cells and waste from the cells. B) Generates electrical impulses for the nervous system. C) Produces hormones for bodily functions. D) Regulates body temperature. Show Answer Correct Answer: A) Transports nutrients to cells and waste from the cells. 7. The ..... are the lower chambers of the heart. A) Aorta. B) Ventricles. C) Atrium. D) Valves. Show Answer Correct Answer: B) Ventricles. 8. What is NOT a key part of the circulatory system? A) Heart. B) Brain. C) Blood. D) Blood vessels. Show Answer Correct Answer: B) Brain. 9. Which structure will be found in the nucleus of a body cell in a woman? A) A X allele. B) B X chromosome. C) C And allele. D) D Y chromosome. Show Answer Correct Answer: B) B X chromosome. 10. Which of the following is the main organ of the circulatory system? A) Lungs. B) Liver. C) Heart. D) Stomach. Show Answer Correct Answer: C) Heart. 11. What is the blood vessel that carrys deoxygenated blood to the lungs from the heart? A) Pulmonary Vein. B) Pulmonary Artery. C) Aorta. D) Vena Cava. Show Answer Correct Answer: B) Pulmonary Artery. 12. The upper chambers of the heart are the ..... A) Artery. B) Ventricle. C) Vestments. D) Atrium. Show Answer Correct Answer: D) Atrium. 13. White blood cells are responsible for ..... A) Blood sugar levels. B) Clotting. C) Transporting Oxygen. D) Protecting against infections. Show Answer Correct Answer: D) Protecting against infections. 14. What is the function of the double circulatory system? A) To pump blood to the heart only. B) To pump blood to the whole body. C) To pump blood to the brain only. D) To pump blood to the lungs only. Show Answer Correct Answer: B) To pump blood to the whole body. 15. What is an arrhythmia? A) Atrial contraction. B) An abnormal heart rhythm. C) Ventricular contraction. D) Capillary dysfunction. Show Answer Correct Answer: B) An abnormal heart rhythm. 16. Which part of the intrinsic conduction system connects the atria to the ventricles, and when damaged can cause various degrees of heart block? A) Atrioventricular (AV) node. B) Bundles of His. C) Purkinje fibers. D) Sinoatrial (SA) node. Show Answer Correct Answer: A) Atrioventricular (AV) node. 17. What is a producers job in the ecosystem? A) To make food and oxygen for the animals. B) To help plants grow. C) To break down dead plants and animals. D) To eat plants and other animals. Show Answer Correct Answer: A) To make food and oxygen for the animals. 18. The function of the heart and blood vessels that supplies oxygen and nutrients to the entire body is known as: A) Cardiopulmonary circulation. B) Systemic circulation. Show Answer Correct Answer: B) Systemic circulation. 19. The large vein that returns blood from the head and upper body to the heart is called A) Superior vena cava. B) Inferior vena cava. C) Coronary arteries. D) Aorta. Show Answer Correct Answer: A) Superior vena cava. 20. Which of the following is NOT a major factor affecting blood flow? A) Heart size. B) Viscosity. C) Exercise. D) Plaque. Show Answer Correct Answer: A) Heart size. ← 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