Which structure is responsible for pulling the atrioventricular valves closed by means of the chordae tendineae?

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Prepare for the VetSkill Level 3 Diploma VN03 - Principles of Veterinary Nursing Care 1 Test. Review essential topics with flashcards and multiple choice questions, complete with hints and detailed explanations. Ensure your success with focused study sessions!

Multiple Choice

Which structure is responsible for pulling the atrioventricular valves closed by means of the chordae tendineae?

Explanation:
The papillary muscles are the structures that pull on the chordae tendineae to keep the atrioventricular valve leaflets closed during ventricular contraction. They contract with the ventricles, tensioning the chordae so the valve leaflets stay in a closed position and prevent backflow into the atria as pressure inside the ventricles rises. The chordae tendineae are the strings that transmit this tension, not the actively pulling force themselves, and the aorta and pulmonary veins are not involved in closing the AV valves. If the papillary muscles (or the chordae) fail, valve leakage can occur, leading to regurgitation.

The papillary muscles are the structures that pull on the chordae tendineae to keep the atrioventricular valve leaflets closed during ventricular contraction. They contract with the ventricles, tensioning the chordae so the valve leaflets stay in a closed position and prevent backflow into the atria as pressure inside the ventricles rises. The chordae tendineae are the strings that transmit this tension, not the actively pulling force themselves, and the aorta and pulmonary veins are not involved in closing the AV valves. If the papillary muscles (or the chordae) fail, valve leakage can occur, leading to regurgitation.

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