Select the correct statement about the structure of the heart wall.
A) The fibrous skeleton forms the bulk of the heart.
B) Connective tissue in the heart wall aids in the conduction of the action potential.
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 middle layer of the heart wall and is composed of cardiac muscle cells responsible for contracting the heart. The fibrous skeleton is a connective tissue structure that provides support and helps anchor heart valves. The endomysium is a connective tissue that surrounds individual cardiac muscle cells, not the heart chambers. Connective tissue in the heart wall does not aid in the conduction of the action potential, but rather specialized cells called the conduction system are responsible for this.

Select the Correct Statement About the Structure of the Heart