Heart: It is part of the vascular system

Heart: It is part of the vascular system, but a specialized and complex part. Consists artery or vein from the inner liner called tunica intima and then in the middle layer tunica media more than anything is composed of smooth muscle and an outer layer called tunica adventitia and special consisting of fibrous tissue and nerves.

In the same way, the heart has three layers:
The inner layer call endocardium which are lined inside fabric of epihtelium and then layer the heart muscles and the name of the myocardium and then an outer layer composed of fibrous tissue in which some grease and call this layer the epicardium and this outer layer come forth nerves and going where the blood vessels that feed the heart muscle.