BI-1105
Arteries, veins and capillaries
Biology · Secondary 3 · Hard · Arteries, veins and capillaries
Blood in leg veins must be returned to the heart against gravity. Varicose veins are common in veins but rare in arteries. Which reason best explains why this condition does not often occur in arteries?
- Arteries do not contain any blood when the body is at rest.
- Arteries have thicker, more muscular walls that resist stretching and blood pooling.
- Arteries carry blood at very low pressure, so their walls never change shape.
- Arteries do not have valves, so blood can easily flow backwards without enlarging them.
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