Final answer:
The layers of the heart from inside to outside are endocardium, myocardium, and epicardium. The endocardium lines the heart chambers and covers the heart valves, while the myocardium consists of heart muscle cells and is responsible for the heartbeat. The epicardium, also known as the visceral pericardium, protects the heart.
Step-by-step explanation:
The layers of the heart from inside to outside are: endocardium, myocardium, and epicardium. The innermost layer is the endocardium, which lines the heart chambers and covers the heart valves. The middle layer is the myocardium, which consists of the heart muscle cells and is responsible for the beating of the heart. The outermost layer is the epicardium, also known as the visceral pericardium, which is a part of the pericardium and protects the heart.