Explain the function of capillaries......
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Capillaries are the smallest type of blood vessel in the body. Their job is to enable the exchange of substances between the blood and surrounding tissues. One place where they can be easily seen (no pun intended!) from the outside is on the whites of the eyes.
Capillaries deliver nutrients and oxygen to tissues and remove the byproducts of cellular reactions, such as carbon dioxide and water. With the exception of the lungs, where the opposite is true, capillaries bring oxygenated blood, blood-carrying oxygen, to organs and carry away deoxygenated blood, blood with the oxygen removed.
Their walls are very thin to allow substances to easily and quickly diffuse, or pass through them. Capillaries are much thinner than arteries and veins, because their walls are made up of only a single layer of endothelial cells, the flat cells that line all blood vessels.
Capillaries are selectively permeable, which means they allow some substances through but not others. Their permeability is what allows them to carry out their job, and how permeable they are varies depending on the organ or tissue they are found in.
Capillaries are delicate endothelial tubes that connect the arterial and venous ends and are arranged in the form of networks called capillary beds.
They serve as the site where oxygen and nutrients pass from the blood into the tissue and carbon dioxide and other waste products pass from the cells into the blood.
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