Chest pain during exertion caused by temporary insufficient blood supply to heart muscle through narrowed coronary arteries is called ____.
Correct answer A. angina pectoris
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Circulation MCQs
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A myocardial infarction (heart attack) occurs when ____.
Correct answer C. a coronary artery is blocked and part of the heart muscle dies
A blood clot that forms in a vessel, breaks free and lodges in a smaller vessel elsewhere is called ____.
Correct answer A. an embolus
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Tissue fluid is formed at the arterial end of a capillary mainly because ____.
Correct answer C. hydrostatic (blood) pressure exceeds the osmotic pull of plasma proteins
A normal resting blood pressure of a healthy young adult is about ____.
Correct answer C. 120/80 mmHg
During which phase of the cardiac cycle are both atria and ventricles relaxed while blood flows passively into the heart?
Correct answer B. Joint (complete) diastole
The valve between the right atrium and right ventricle is the ____.
Correct answer D. tricuspid valve
What prevents the atrioventricular valve cusps from turning inside out into the atria when the ventricles contract?
Correct answer A. Chordae tendineae attached to papillary muscles
Which blood vessels open into the right atrium?
Correct answer A. Superior vena cava, inferior vena cava and coronary sinus
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Which vessel carries deoxygenated blood away from the heart?
Correct answer D. Pulmonary artery
The heart muscle receives its own oxygenated blood supply through the ____.
Correct answer D. coronary arteries
The middle muscular layer of the heart wall is the ____.
Correct answer B. myocardium
The natural pacemaker of the human heart is the ____.
Correct answer D. sinoatrial (SA) node
What is the main function of the short delay of impulses at the atrioventricular (AV) node?
Correct answer D. It allows the atria to finish contracting before the ventricles contract
Which part of the conducting system spreads impulses rapidly through the walls of the ventricles?
Correct answer A. Purkinje fibres
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Heart muscle is described as myogenic because ____.
Correct answer D. its contraction is started by impulses generated within the heart itself
At a heart rate of 75 beats per minute, how long does one cardiac cycle last?
Correct answer A. 0.8 s
In a cardiac cycle of 0.8 s, approximately how long is ventricular systole?
Correct answer B. 0.3 s
Which chamber of the human heart has the thickest muscular wall?
Correct answer D. Left ventricle
The second heart sound ‘dub’ is produced by ____.
Correct answer C. closure of the semilunar valves