Veins and venules are the only blood vessels to have valves because all other blood vessels have high pressure that does not allow backwards flow.
Las venas y vénulas son los únicos vasos sanguíneos que tienen válvulas porque todos los demás vasos sanguíneos tienen alta presión que no permite el flujo hacia atrás.
| Front | Why are veins and venules the only blood vessels to have valves? |
|---|---|
| Back | All other blood vessels have high pressure that does not allow backwards flow. |
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