DIFFERENCE BETWEEN ARTERIES, CAPILLARIES AND VEINS
| Arteries | Capillaries | Veins |
| Away from heart | Wall only one cell thick-really thin -diffusion | Blood into heart |
| Mainly carry oxygenated blood | smallest blood vessel | Most carries de-oxygenated |
| High pressure | Lower pressure | |
| No valves | Valves | |
| Thick outer wall (pumps a lot more blood) | Thin outer walls | |
| Thick inner layer of muscle and elastic fibres | Thin inner layer | |
| Narrow central tube-small lumen(where the blood flows through) | Wide central tube -large lumen |
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