The myocardium (middle layer) has the bulk of the muscle which pumps blood from the ventricles.
Blood
The myocardium is the thickest layer of the heart made of contractile muscles that pumps blood.
Oxygenated blood is brought to the myocardium by coronary arteries. These arteries are located all around he surface of the heart.
The layer of the heart responsible for pumping blood is the myocardium. This is the middle layer of the heart made up of cardiac muscle tissue that contracts to push blood through the circulatory system.
The myocardium is the middle layer of the walls of the heart, made of cardiac muscle, that contracts to push out blood.
The myocardium or heart muscle is nourished with oxygen-rich blood. The vessel that delivers the blood to the myocardium is called Coronary Arteries.
The coronary pathway takes blood to the heart.Related Information:Coronary arteries surround the heart and provided the muscles of the heart with blood.
Aorta
myocardium
You have three layers in the heart. Outer layer is pericardium, middle layer is myocardium and inner layer is endocardium. Myocardium is composed mainly of cardiac muscles, connective tissue and blood vessels.
"Myo-" means muscle and "-cardium" means heart. So myocardium is heart muscle. It's the stuff that actually does the work of contracting the heart to pump blood around.