What primarily prevents the atrioventricular valves from inverting during ventricular contraction?
Understand the Problem
The question is asking about the mechanical function of the heart's atrioventricular valves during the contraction of the ventricles. It specifically seeks to identify the primary factor that prevents these valves from inverting under pressure, presenting multiple choice options to select from.
Answer
Chordae tendineae
The chordae tendineae primarily prevent the atrioventricular valves from inverting during ventricular contraction.
Answer for screen readers
The chordae tendineae primarily prevent the atrioventricular valves from inverting during ventricular contraction.
More Information
Chordae tendineae connect the atrioventricular valves to the papillary muscles within the ventricles. During ventricular contraction, these tendons maintain a steady tension, preventing the valves from being pushed into the atria, which would compromise heart function.
Tips
A common mistake is to assume the papillary muscles themselves directly prevent valve inversion. Instead, they contract to keep the chordae tendineae taut.
Sources
- Heart valve - Wikipedia - en.wikipedia.org
- The leaflets of the atrioventricular valves are held | Chegg.com - chegg.com
- 19.1 Heart Anatomy - Oregon State University - open.oregonstate.education
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