Now the heart is basically a pump. In fact it consists of two individual pumps that are connected in serious with respect to one another. So next to one another we have a pump on the right side that consists of the right right atrium and the right ventricle. And we have a pump on the left side that consists of the left atrium and the left ventricle. Now, unlike skeletal muscle which is actually attached to our bone and contracts with the bone, the heart is not actually attached to any bone. The heart consists of cardiac muscle which forms a web like net that contracts upon itself.