Biology · Human Circulatory System
In the limbs, blood flows against gravity back to the heart. It is prevented from flowing backward primarily by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The extremely low pressure of venous blood
- 2Valves inside the veins✓
- 3Movements in the surrounding skeletal muscles
- 4The narrowing down of the lumen of veins by contraction
Correct answer
Valves inside the veins
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