Select the correct statement about the structure of the heart wall.
A) Connective tissue in the heart wall aids in the conduction of the action potential.
B) The fibrous cardiac skeleton forms the bulk of the heart.
C) The heart chambers are lined by the endomysium.
D) The myocardium is the layer of the heart that actually contracts.

Question

Quizplus · Accepted Answer

The myocardium is the thick, muscular layer of the heart wall that actually contracts to pump blood. Connective tissue in the heart wall helps to anchor and support the cardiac muscle fibers, but does not aid in the conduction of the action potential. The fibrous cardiac skeleton is a framework of collagenous and elastic fibers that provides structural support for the heart and helps to anchor the cardiac muscle fibers. The heart chambers are lined by the endocardium, not the endomysium, which is a layer of connective tissue that surrounds individual muscle fibers.

Select the Correct Statement About the Structure of the Heart