GENERAL HISTOLOGY

Detailed explanation-1: -Arteries are always under high pressure. To accommodate this stress, they have an abundance of elastic tissue and less smooth muscle. The presence of elastin in the large blood vessels enables these vessels to increase in size and alter their diameter.

Detailed explanation-2: -The largest blood vessels are arteries and veins, which have a thick, tough wall of connective tissue and and many layers of smooth muscle cells (Figure 22-22). The wall is lined by an exceedingly thin single sheet of endothelial cells, the endothelium, separated from the surrounding outer layers by a basal lamina.

Detailed explanation-3: -Thick walls of arteries help them to resist the pressure of the flow of blood in them. Elastic walls of arteries: The elastic layer allows stretching and absorbs pressure. The walls stretch and recoil in response to pumping, thus peaks in pressure are absorbed.

Detailed explanation-4: -Answer and Explanation: Elastic connective tissue is springlike and is found in the middle walls of the arteries. Elastic connective tissue is able to return to its original form after being stretched due to the elastic fibers.

Detailed explanation-5: -In elastic arteries, the tunica media is rich with elastic and connective tissue. The aorta: The aorta makes up most of the elastic arteries in the body.