Veins have a wider lumen, little elastic or muscular tissue, and contain valves to prevent backflow of blood; blood flows at low pressure and is usually deoxygenated, except for the pulmonary vein.
As veias têm um lúmen mais largo, pouco tecido elástico ou muscular e contêm válvulas para prevenir o refluxo sanguíneo; o sangue flui a baixa pressão e geralmente está desoxigenado, exceto na veia pulmonar.
| Front | What are the structural features of a vein |
|---|---|
| Back | Wider lumen Little elastic or muscular tissue Veins contain valves to prevent the back flow of blood Blood flows at low pressure and is usually deoxygenated except for pulmonary vein. |
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