In humans, which of the following blood vessels have an outer layer of elastic in their walls?

a)arteries near the heart





b)veins near the heart





c)veins in the legs





d)arteries in the legs





e)arteries in the head





Please provide an explanationIn humans, which of the following blood vessels have an outer layer of elastic in their walls?
A)


The vessels which receive blood from the heart, the elastic arteries, have thick, strong walls to cope with the sudden high pressure produced during diastole; they contain abundant elastic material to allow stretch so that the vessel lumen may accommodate the change of volume. They also have a thick, outer coat of collagenous connective tissue whose tensile strength prevents over-distension of the elastic tissue. The elastic recoil of these elastic arteries is responsible for maintaining a continuous, though decreased, flow of blood to smaller vessels during systole.