A) right ventricle.
B) left atrium.
C) aorta.
D) left ventricle.
E) lungs.

A) pulmonary artery
B) aorta
C) carotid artery
D) pulmonary vein
E) iliac vein

A) Arteries have an endothelial lining that reduces friction and promotes smooth blood flow.
B) Arteries have a smooth muscle layer on the outside, which provides some stiffness.
C) Elastin fibers in arterial walls allow stretching of the arteries.
D) Valves along major arteries maintain directed blood flow.
E) A tough supportive layer of connective tissue containing collagen is found on the outer surface of arteries.