Because your heart is a muscle, a cardiac muscle. a muscles job is to contract an that is exactly what the heart does, it contracts to pump blood.
cardiac muscle! Oh and if you say the heart doesn't have a muscle U R STUPID! It has a muscle
Your heart is a muscle. It is also called the myocardium. The muscle cells in the heart muscle are called myocardiocytes.
Your heart
the heart is made out of a special type of muscle called cardiac muscle
The heart is a muscle.
The heart is a cardiac muscle
The muscle layer of the heart is the myocardium (or cardiac muscle).
The heart is a muscle so the heart is made of the cardiac muscle.
The heart IS a muscle.
The muscle of your heart MUSCLE would be your heart.
No because your heart is a muscle so there are no muscles within the heart.
The heart is made of smooth and cardiac muscle