PATHOLOGY

Detailed explanation-1: -Capillaries are the blood vessels that reach out to small cells and tissue, helping in the exchange of materials like oxygen, carbon dioxide, and waste. Capillaries are semipermeable so that material can be exchanged with surrounding cells.

Detailed explanation-2: -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-3: -Diffusion is the process by which exchange of gases take place between blood and body tissues. Respiratory gas is transported to each and every cell by blood. Tiny capillaries provide the blood flow to even remote parts of the body tissue.