BI-1142
Arteries, veins and capillaries
Biology · Secondary 3 · Medium · Arteries, veins and capillaries
Which statement correctly describes how blood in leg veins returns to the heart despite having low pressure?
- Blood is sucked back by high pressure in the veins.
- Gravity pulls blood upwards towards the heart.
- Contraction of leg muscles and valves in veins push blood towards the heart.
- Thick muscular walls of veins pump blood like the heart.
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