ANATOMY

Detailed explanation-1: -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.

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: -The pulmonary vein carries oxygen around the body back to the heart. It, therefore, has the greatest oxygen content.

Detailed explanation-4: -(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body. Q. Assertion: Arteries have thick elastic walls. Reason: Blood flow in arteries is rapid and at high pressure.

Detailed explanation-5: -Arteries are blood vessels that carry blood away from the heart. Because they are under high pressure, arteries have strong elastic walls.