Question

What are the three layers of the heart, from inside to outside?

Answer 1

The three layers of the heart, from inside to outside, are the endocardium, myocardium, and epicardium.

Step-by-step explanation:

The three layers of the heart, from inside to outside, are:

1. Endocardium: This is the innermost layer of the heart wall. It is a smooth lining that covers the chambers of the heart and the heart valves.
2. Myocardium: This is the middle layer and the thickest layer of the heart wall. It consists mainly of cardiac muscle cells and is responsible for the contraction and pumping action of the heart.
3. Epicardium: This is the outermost layer of the heart wall and the innermost layer of the pericardium. It is also known as the visceral pericardium. The epicardium protects the heart and provides a smooth surface for the heart to move within the pericardium.