Practice Quiz

NREMT Advanced EMT Practice Test #3

Category - EMT-I/99

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What fibrous structures attach to papillary muscles in the ventricles?
  1. Diastole Fibers
  2. Chordae Tendonae
  3. Chordae Fibers
  4. Cardiac Tendonae
Explanation
Answer - B - The chordae tendonae is a fibrous structure that attaches to papillary muscles in the ventricles. Their purpose is to prevent regurgitation of blood into the atria that would occur if the AV valves were allowed to invert during ventricular contraction. There are no such structures in the atria or on the semi-lunar valves.
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