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.
Capillaries are so small that red blood cells can only travel through them in single file. Capillary walls are thin and are composed of endothelium (a type of simple squamous epithelial tissue). Oxygen, carbon dioxide, nutrients, wastes, and fluids are exchanged through the thin walls of the capillaries. Once the blood leaves the capillaries it is returned to the heart via the veins.
Think you know all about capillary function and the heart? Test your knowledge of blood vessels and heart anatomy, take the Heart Anatomy Quiz!
Capillaries are so small that red blood cells can only travel through them in single file. Capillary walls are thin and are composed of endothelium (a type of simple squamous epithelial tissue). Oxygen, carbon dioxide, nutrients, wastes, and fluids are exchanged through the thin walls of the capillaries. Once the blood leaves the capillaries it is returned to the heart via the veins.
Think you know all about capillary function and the heart? Test your knowledge of blood vessels and heart anatomy, take the Heart Anatomy Quiz!
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