Blood flowing against gravity is prevented from flowing back by A) the extremely low pressure of blood B) valves C) movements in the surrounding muscles D) the narrowing down of the lumen of veins by the contraction of the muscle layer comprising their walls

Asked in ASSISTANT AUDIT OFFICER 2017 18 2017 · Topic: Circulatory System (Types of Blood Vessels: Arteries, Veins, Capillaries – Structure and Function)

1. the extremely low pressure of blood
2. valves
3. movements in the surrounding muscles
4. the narrowing down of the lumen of veins by the contraction of the muscle layer comprising their walls

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