Answer:
The heart is made of cardiac muscle. (myocardium)
Explanation:
The myocardium is one of the three variations on vertebrate muscles, as shown in the image below. It contrasts to skeletal and smooth muscle in that it acts involuntary, it is a striated muscle constituting the dominant tissue that makes up heart's walls.
As the cardiac muscle posses a thick middle layer between the outer layer (called the epicardium) and the inner layer (known as endocardium) the blood is provided through coronaries (blood circulating in the coronary or heart veins).
Heart muscle cells are put together by discs, rich in collagen fibres and substances that keep it working since birth and until death.
Ventricles are responsible for irrigating with blood, as capilars are indispensable for the high energy requirements of the main muscle and motor of the organism
Below are the different muscle tissues:
