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

The heart is the major organ of the circulatory system it has various layers and vessels for blood circulation in its structure. The myocardium layer of the heart contracts.

What is the myocardium layer?

The myocardium is the heart muscle that is responsible to protect the heart and forms the thickest middle layer of the structure. It is made up of cardiac muscle cells.

The major function of the myocardium is to pump oxygenated blood to the tissues of the body parts. It majorly contracts and pumps the oxygen-rich blood from the heart to the other body parts.

Their actions are involuntary and cannot be controlled. This contraction is also called the heartbeat.

Therefore, option D. the myocardium in the heart contract is the correct statement about the structure of the heart wall.

Learn more about the myocardium here:

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