NEET PG DENTAL EXAM

Detailed explanation-1: -In arteries there is a lot more pressure, due to the force of blood being pumped outwards from the heart, so they need thicker walls in order to prevent bursting. In veins the pressure is much less, and so thinner walls are present.

Detailed explanation-2: -Veins have thicker walls than capillaries. Veins use valves to transport blood towards the heart, but capillaries don’t have valves. Capillaries diffuse blood and nutrients between veins and arteries through their thin walls.

Detailed explanation-3: -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.

Detailed explanation-4: -The tunica media, which in an artery is composed of muscle and elastic fibres, is thinner in a vein and contains less muscle and elastic tissue, and proportionately more collagen fibres (collagen, a fibrous protein, is the main supporting element in connective tissue).