A capillary is a small blood vessel that connects arterioles to venules. Capillaries are the smallest blood vessels in the body and have a diameter of only 5-10 micrometers. They are lined with a single layer of endothelial cells and have a very thin wall. This allows for the exchange of oxygen, carbon dioxide, and other nutrients between the blood and the tissues.
Capillaries are found in all tissues of the body, except for the brain, spinal cord, and cartilage. They are most numerous in the lungs, kidneys, and liver.
The function of capillaries is to allow for the exchange of materials between the blood and the tissues. This includes the exchange of oxygen, carbon dioxide, and other nutrients. Capillaries also help to regulate blood pressure and body temperature.
Capillary beds are networks of capillaries that are found in all tissues of the body. Capillary beds allow for the exchange of materials between the blood and the tissues. They also help to regulate blood pressure and body temperature.