Question

multiple select question
select all that apply
what factors contribute to venous return to the heart?
□ pressure changes during breathing
□ vein vasoconstriction
□ smooth muscle contraction in the walls of arteries
□ skeletal muscle contractions

Explanation:

Pressure changes during breathing create a pressure - gradient that helps blood flow back to the heart. Vein vasoconstriction reduces the volume of veins, pushing blood towards the heart. Skeletal muscle contractions act as a "muscle pump", squeezing veins and aiding venous return. Smooth muscle contractions in artery walls are mainly related to blood pressure regulation in arteries and not directly to venous return.

Answer:

• Pressure changes during breathing
• Vein vasoconstriction
• Skeletal muscle contractions