ANATOMY

Detailed explanation-1: -Capillaries are the smallest blood vessels in the body. How small are they? About ten of them equal the thickness of one human hair, and most are so small that only one blood cell can pass through them at a time.

Detailed explanation-2: -Capillaries, the smallest blood vessels, connect arteries and veins.

Detailed explanation-3: -Why Are Capillaries Very Small in Size? Capillaries need to be small in order to facilitate oxygen and carbon dioxide gas exchange in cells. 3 They also play a role in fluid and nutrient exchange, forming the connection between the body’s smallest arteries (arterioles) and smallest veins (venules).

Detailed explanation-4: -Blood capillaries are the smallest blood vessels. Each capillary is up to a few cells thick to allow diffusion of blood through it to the organs/tissues.