What is the is the job capillaries?

Answer 1

A capillary is an extremely small blood vessel located within the tissues of the body, that transports blood from arteries to veins. Capillaries are most abundant in tissues and organs that are metabolically active. For example, muscle tissues and the kidneys have a greater amount of capillary networks than do connective tissues.

Answer 2

Capillaries are the smallest, most numerous branch of the blood vessels in the circulatory system. They are just about everywhere in the body (with notable exceptions, like the inner eye). Red blood cells pass through them and drop off oxygen in exchange for carbon dioxide, in most body tissues (except in lungs, where it's reverse). Other blood cells and blood products pass through them and out into the body tissues as well. The most famous job of the capillaries, though, is to be a drop-off/pick-up site for oxygen and carbon dioxide.

Answer 3

Capillaries are small blood vessels. We can't do without them, because our extremities (such as our fingers) are too small to be run by our normal veins and arteries (they're too big!). So we rely on capillaries to carry blood to and from our extremities.