Which of the Following Statements is Correct About the Structure

Question

Which of the following statements is correct about the structure of the heart wall?
A) The myocardium is the layer of the heart wall that contracts.
B) The heart chambers are lined by endomysium.
C) Connective tissue in the heart helps in conduction of the action potential.
D) The fibrous skeleton forms the bulk of the heart.

Accepted Answer

The myocardium is the middle layer of the heart wall that is responsible for contracting and pumping blood. The endomysium is a layer of connective tissue that surrounds individual cardiac muscle fibers within the myocardium. Connective tissue in the heart does play a role in conduction, but the fibrous skeleton is the structure that provides the framework for the heart and helps to anchor the heart valves. Therefore, option A is the correct statement about the structure of the heart wall.