Question
First cardiac sound (lub) is associated with(a) Closure of tricuspid and bicuspid valves(b) Opening of tricuspid valves(c) Closure of semilunar valves(d) Opening of semilunar valves
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Step 1: The first cardiac sound, also known as "lub", is associated with the closure of certain heart valves. Show more…
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The "lub," or first heart sound, is produced by closing of the a. aortic semilunar valve. c. tricuspid valve. b. pulmonary semilunar d. bicuspid valve. valve. e. both AV valves.
The first heart sound represents which portion of the cardiac cycle? a. atrial systole b. ventricular systole c. closing of the atrioventricular valves d. closing of the semilunar valves
When ventricular systole occurs (a) Atrial diastole coincides (b) Tricuspid and bicuspid valves close (c) Semilunar valves guarding pulmonary artery and aorta are forced to open (d) All the above
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