Free Human Heart MCQs with Answers
70 Human Heart MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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- A. holds a far larger volume of blood
- B. must pump blood against the much greater resistance of the systemic circuit
- C. contains more valves than the right ventricle
- D. receives blood at a higher pressure from the left atrium
Explanation: Both ventricles eject the same volume with each beat, but the left has to drive blood through the whole body while the right only sends it…
Correct answer: must pump blood against the much greater resistance of the systemic circuit- A. tricuspid valve
- B. bicuspid valve
- C. aortic semilunar valve
- D. pulmonary semilunar valve
Explanation: The right atrioventricular valve has three flaps and is therefore called tricuspid, while the left one has two and is called bicuspid or…
Correct answer: tricuspid valve- A. pulmonary arteries
- B. coronary arteries
- C. blood passing through the chambers
- D. superior vena cava
Explanation: The coronary arteries branch from the base of the aorta and spread over the heart wall, because the myocardium is far too thick for the…
Correct answer: coronary arteries- A. has no nucleus and is biconcave in shape
- B. has a large nucleus and many mitochondria
- C. is amoeboid and can leave the capillaries
- D. lives for about ten days
Explanation: Losing the nucleus makes room for more haemoglobin, and the biconcave disc shape gives a large surface area for gas exchange and enough…
Correct answer: has no nucleus and is biconcave in shape- A. the heart has two sides
- B. arteries and veins run side by side
- C. blood passes through the heart twice in one complete circuit of the body
- D. there are two types of blood cell
Explanation: Blood goes heart to lungs to heart in the pulmonary circuit and then heart to body to heart in the systemic circuit, so it passes through…
Correct answer: blood passes through the heart twice in one complete circuit of the body- A. failure of the sinoatrial node to fire
- B. leakage of the bicuspid valve
- C. an increase in the number of red blood cells
- D. blockage of a coronary artery by a thrombus on an atherosclerotic plaque
Explanation: Fatty plaques narrow a coronary artery over years, and when one ruptures a clot forms and cuts off the blood supply, so the muscle beyond…
Correct answer: blockage of a coronary artery by a thrombus on an atherosclerotic plaque- A. atria
- B. ventricles
- C. valves
- D. septum
Explanation: The right atrium collects deoxygenated blood from the venae cavae and the left atrium receives oxygenated blood from the pulmonary veins.
Correct answer: atria- A. pericardium
- B. interventricular septum
- C. mitral valve
- D. aorta
Explanation: The muscular septum keeps oxygenated and deoxygenated blood completely separate, which is essential for the high efficiency of the…
Correct answer: interventricular septum- A. bicuspid valves
- B. tricuspid valves
- C. semilunar valves
- D. atrioventricular valves
Explanation: Their three crescent shaped pockets fill with blood and snap shut when the ventricles relax, preventing backflow from the great arteries.
Correct answer: semilunar valves- A. pleura
- B. peritoneum
- C. meninges
- D. pericardium
Explanation: The pericardium anchors the heart in the chest and secretes fluid that lubricates its beating.
Correct answer: pericardium- A. pulmonary artery, which carries it to the lungs
- B. aorta, which carries it to the body
- C. coronary artery, which feeds the heart muscle
- D. vena cava, which returns it to the heart
Explanation: The right side handles deoxygenated blood and sends it to the lungs for oxygenation, while the left side sends oxygenated blood to the…
Correct answer: pulmonary artery, which carries it to the lungs- A. pump blood only into the adjacent ventricles
- B. never contract at all
- C. pump blood to the whole body
- D. contain no muscle tissue
Explanation: Atria need only enough force to top up the ventricles below, so their muscle is thin.
Correct answer: never contract at all- A. epicardium
- B. pericardium
- C. myocardium
- D. endocardium
Explanation: The myocardium is cardiac muscle supplied by the coronary arteries, and its death during a heart attack is what damages the pump.
Correct answer: myocardium- A. 0.1 second
- B. 0.4 second
- C. 1.2 seconds
- D. 0.8 second
Explanation: Sixty seconds divided by 75 beats gives 0.8 second per cycle, of which atrial contraction takes about 0.1, ventricular contraction 0.3 and…
Correct answer: 0.8 second- A. the ventricles contract and the semilunar valves open
- B. the ventricles relax and fill with blood
- C. the semilunar valves close
- D. the atrioventricular valves open wide
Explanation: Systole means contraction: rising pressure in the ventricles closes the inlet atrioventricular valves and forces open the semilunar…
Correct answer: the ventricles contract and the semilunar valves open- A. atrioventricular valves
- B. semilunar valves
- C. coronary valves
- D. pulmonary veins
Explanation: When the ventricles relax, blood trying to flow back snaps the aortic and pulmonary semilunar valves shut, producing the shorter, sharper…
Correct answer: semilunar valves- A. repolarisation of the ventricles
- B. contraction of the ventricles
- C. depolarisation and contraction of the atria
- D. closure of the heart valves
Explanation: The P wave records the spread of excitation across the atria, which then contract.
Correct answer: depolarisation and contraction of the atria- A. sinoatrial node
- B. coronary vein
- C. pulmonary vein
- D. bundle of His and Purkinje fibres
Explanation: The bundle of His carries the impulse down the septum and the Purkinje fibres spread it through the ventricle walls from the apex upwards…
Correct answer: bundle of His and Purkinje fibres- A. close, preventing blood from flowing back into the atria
- B. open fully to let blood into the ventricles
- C. dissolve under pressure
- D. contract actively like muscle
Explanation: Rising ventricular pressure lifts the flaps of the tricuspid and bicuspid valves shut, and chordae tendineae anchored to papillary muscles…
Correct answer: close, preventing blood from flowing back into the atria- A. pulse rate per minute
- B. systolic pressure while the ventricles contract
- C. diastolic pressure while the heart relaxes
- D. average pressure of the cycle
Explanation: The higher number is recorded at ventricular contraction when arterial pressure peaks, and the lower number is the resting pressure during…
Correct answer: systolic pressure while the ventricles contractHuman Heart MCQs: common questions
Are these Human Heart MCQs free?
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There are 70 Human Heart MCQs in the Biology bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Human Heart MCQ have an explanation?
Yes. Each Human Heart question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
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