BI-1132
Arteries, veins and capillaries
Biology · Secondary 3 · Medium · Arteries, veins and capillaries
Varicose veins are more common in the legs than in the arms. Which reason best explains this?
- Leg veins work against gravity, so faulty valves cause blood pooling
- Leg veins do not contain any smooth muscle at all
- Blood pressure in leg veins is always higher than in arteries
- Leg veins do not contain any blood at rest
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