NEET PG DENTAL EXAM

Detailed explanation-1: -Capillaries are the connection of the smallest branches of arteries and veins. The capillary walls are one cell thick. Capillaries allow molecules to pass through across the capillary walls. This exchange of materials is not possible across the walls of other types of blood vessels because the walls are too thick.

Detailed explanation-2: -The main function of capillaries is to transport digested food, oxygen, and other materials to all the cells of the body. Hence, their walls are thin, so that the substances can get in and out of them easily by diffusion.

Detailed explanation-3: -Capillaries allow exchange of substances with body tissues through their thin walls. As blood travels at high pressure in the arteries towards the capillaries, pressure filtration occurs which results in plasma passing through the capillary wall into the tissue fluid which surrounds the cell.

Detailed explanation-4: -Capillaries allow the exchange of gasses, nutrients, hormones, and other molecules in the blood. These materials are exchanged with the cells of the body. Carbon dioxide and waste are transferred from the body to the capillaries.