MICROANATOMY

Detailed explanation-1: -Capillaries. Capillaries are tiny, extremely thin-walled vessels that act as a bridge between arteries (which carry blood away from the heart) and veins (which carry blood back to the heart).

Detailed explanation-2: -Capillaries are the thinnest blood vessels in the body. Capillaries help in gaseous exchanges between the tissue and blood.

Detailed explanation-3: -The walls of veins have the same three layers as the arteries. Although all the layers are present, there is less smooth muscle and connective tissue. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has less pressure than in the arteries.

Detailed explanation-4: -Due to the thick walls of arteries and veins, blood molecules or cells cannot permeate into bodily cavities. Thus, The walls of capillaries are the thinnest.

Detailed explanation-5: -Arteries have thick walls because they need to withstand high pressure generated by the heart. Veins have thin walls because they do not need to withstand as much pressure. Arteries are also narrower than veins, which allows for faster blood flow.