ACSM
010-111 · Question #203
010-111 Question #203: Real Exam Question with Answer & Explanation
The correct answer is C. Papillary muscle. Papillary muscles, anchored to AV valve leaflets via the chordae tendineae, contract during ventricular systole to prevent valve prolapse and maintain closure.
Question
Which structure is responsible for maintaining atrio-ventricular valve closure in the heart?
Options
- APurkinje Fibers
- BForamen Ovale
- CPapillary muscle
- DCardiac myocyte
Explanation
Papillary muscles, anchored to AV valve leaflets via the chordae tendineae, contract during ventricular systole to prevent valve prolapse and maintain closure.
Common mistakes.
- A. Purkinje fibers are components of the cardiac electrical conduction system and have no mechanical role in maintaining valve closure.
- B. The foramen ovale is a fetal interatrial opening that typically closes after birth and has no role in AV valve function.
- D. Cardiac myocytes are general contractile cells of the myocardium and are not specialized structures responsible for AV valve closure specifically.
Concept tested. Papillary muscle role in atrioventricular valve closure
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