Human Heart - 50 Important MCQs

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 1. The human heart has how many chambers? A) 2 B) 3 C) 4 ✅ D) 5 Answer: C) 4 Explanation: The human heart has four chambers—two atria and two ventricles. 2. Which side of the heart pumps oxygenated blood to the body? A) Right side B) Left side ✅ C) Both sides D) Middle chamber Answer: B) Left side Explanation: The left side pumps oxygen-rich blood through the aorta to the body. 3. Which blood vessel carries blood away from the heart? A) Vein B) Capillary C) Artery ✅ D) Venule Answer: C) Artery Explanation: Arteries carry blood away from the heart. 4. Which chamber receives oxygenated blood from the lungs? A) Right atrium B) Right ventricle C) Left ventricle D) Left atrium ✅ Answer: D) Left atrium Explanation: Oxygenated blood enters the left atrium through the pulmonary veins. 5. Which chamber has the thickest wall? A) Right atrium B) Left atrium C) Right ventricle D) Left ventricle ✅ Answer: D) Left ventricle Explanation: It pumps blood to the entire body. 6. The normal resting h...

Human Heart

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All Important Points About Human Heart 
1. The human heart is a muscular organ.
2. It is located in the thoracic cavity between the lungs.
3. The heart is about the size of a clenched fist.
4. An average adult heart weighs about 250–350 grams.
5. The heart pumps blood throughout the body.
6. It is the main organ of the circulatory system.
7. The human heart has four chambers.
8. The upper chambers are called atria.
9. The lower chambers are called ventricles.
10. Right atrium receives deoxygenated blood.
11. Left atrium receives oxygenated blood.
12. Right ventricle pumps blood to the lungs.
13. Left ventricle pumps blood to the body.
14. The left ventricle has the thickest wall.
15. The heart is enclosed by the pericardium.
16. Pericardium is a double-layered membrane.
17. The heart wall has three layers.
18. These layers are epicardium, myocardium, and endocardium.
19. Myocardium is the muscular middle layer.
20. The heart contains four valves.
21. Tricuspid valve lies between right atrium and right ventricle.
22. Bicuspid (mitral) valve lies between left atrium and left ventricle.
23. Pulmonary valve guards the pulmonary artery.
24. Aortic valve guards the aorta.
25. Valves prevent backflow of blood.
26. The aorta is the largest artery in the body.
27. Pulmonary artery carries deoxygenated blood.
28. Pulmonary veins carry oxygenated blood.
29. Superior vena cava brings blood from the upper body.
30. Inferior vena cava brings blood from the lower body.
31. Coronary arteries supply blood to the heart muscle.
32. Coronary veins drain blood from the heart muscle.
33. The heart beats about 60–100 times per minute in adults.
34. Average resting heart rate is about 72 beats per minute.
35. One complete heartbeat is called a cardiac cycle.
36. Lub sound is produced by closure of AV valves.
37. Dub sound is produced by closure of semilunar valves.
38. SA node is the natural pacemaker of the heart.
39. SA node is located in the right atrium.
40. AV node receives impulses from the SA node.
41. Bundle of His conducts impulses to ventricles.
42. Purkinje fibers distribute impulses in ventricles.
43. The heart works continuously throughout life.
44. The human heart starts beating before birth.
45. Blood circulation was explained by William Harvey.
46. The right side of the heart handles deoxygenated blood.
47. The left side of the heart handles oxygenated blood.
48. The heart pumps nearly 5 liters of blood per minute.
49. Regular exercise strengthens the heart.
50. A healthy diet supports heart health.

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