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The smallest blood vessel is called _________.
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Capillaries are tiny blood vessels that connect arterioles (small arteries) and venules (small veins). They are the smallest and most numerous blood vessels in the body. Capillaries are so small that red blood cells can only pass through them in single file. Their thin walls allow for the exchange of gases, nutrients, and waste products between the blood and surrounding tissues. This exchange is essential for the functioning of cells and tissues throughout the body. Capillaries play a crucial role in the circulatory system, facilitating the delivery of oxygen and nutrients to cells and the removal of waste products such as carbon dioxide.