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 myocardium is the layer of the heart that actually contracts.
C) The fibrous cardiac skeleton forms the bulk of the heart.
D) The heart chambers are lined by the endomysium.

Question

Quizplus · Accepted Answer

The myocardium is the middle layer of the heart wall and is responsible for the contraction of the heart.

Option A is incorrect because connective tissue in the heart wall functions to provide structural support and organization, not aid in the conduction of the action potential.

Option C is incorrect because the fibrous cardiac skeleton is a network of connective tissue that separates the atria from the ventricles and provides attachment for the heart valves and cardiac muscle fibers. It does not form the bulk of the heart.

Option D is incorrect because the heart chambers are lined by the endocardium, not the endomysium. The endomysium is a connective tissue layer that surrounds individual cardiac muscle fibers.

Select the Correct Statement About the Structure of the Heart