MEDICAL PHYSIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -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-3: -Arteries have thick walls so they can handle the high pressure and velocity that expels your blood out of your heart. Veins carry blood back to your heart from the rest of your body. The pressure of the blood returning to the heart is very low, so the walls of veins are much thinner than arteries.

Detailed explanation-4: -Blood vessels include arteries, capillaries, and veins. Arteries carry blood away from the heart and can divide into large and small arteries. Large arteries receive the highest pressure of blood flow and are thicker and more elastic to accommodate the high pressures.