The REAL Reason Why Your Arteries are Calcifying and Turning into Bone
The systemic circuit. In this pathway, oxygen-rich blood is carried away from the heart and toward tissues of the body.
The pulmonary circuit. In the pulmonary circuit, oxygen-depleted blood is carried away from the heart and into the lungs where it can acquire fresh oxygen and get rid of carbon dioxide.
Arteries can also be divided into elastic and muscular arteries based off of the material of their tunica media or middle layer.
Elastic arteries
are closer to the heart where blood pressure is highest
contain more elastic fibers, which allows them to both expand and contract with the surges of blood that occur when the heart beats
Muscular arteries
are further from the heart where blood pressure is lower
contain more smooth muscle tissue and less elastic fibers
Artery wall layers