NEET BIOLOGY

Detailed explanation-1: -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-2: -Veins have thick, elastic and muscular walls.

Detailed explanation-3: -They have a thick wall containing an outer layer of collagen to prevent the artery from rupturing under the high pressure. The arterial wall also contains an inner layer of muscle and elastic fibres to help maintain pulse flow (it can contract and stretch)

Detailed explanation-4: -Arteries and arterioles have relatively thick muscular walls because blood pressure in them is high and because they must adjust their diameter to maintain blood pressure and to control blood flow.