Final answer:
Venoconstriction is not a major factor promoting the flow of venous blood.
Explanation:
Venoconstriction is not one of the major factors that promote the flow of venous blood. The flow of venous blood is primarily aided by skeletal muscle contraction, breathing, and arterial blood pressure. Venoconstriction refers to the constriction of veins, which would not directly promote the flow of blood.
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