the smallest blood vessels are the capillaries. They are the only vessels that allow diffusion. Think that they are so thin, that blood just goes through, but, when it goes through the capillaries, the oxygen, nutrients, and other waste products are too big to diffuse, so they just stay in the capillaries. They could be just used to take the waste to the lungs, or diffuse blood to veins to take it to the heart
the smallest blood vessels are the capillaries. They are the only vessels that allow diffusion. Think that they are so thin, that blood just goes through, but, when it goes through the capillaries, the oxygen, nutrients, and other waste products are too big to diffuse, so they just stay in the capillaries. They could be just used to take the waste to the lungs, or diffuse blood to veins to take it to the heart
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