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Red blood cells (RBCs), also known as erythrocytes, deliver oxygen to the tissues in your body.
Arteries carry blood away from the heart. The arterial red blood cells are usually oxygenated, with the exception of the pulmonary arteries.
This outermost layer is composed of connective tissue with varying amounts of elastic and collagenous fibers to provide structural support and shape to the vessel.
The tunica media consists of smooth muscle cells intermingled with elastic fibres. It supports and helps regulate the internal vessel diameter to help blood flow and pressure.
It is made up of a single layer of endothelial cells and connective tissue that serves as a frictionless contact surface for blood flow.