Muscle contractions assist venous return to the heart. This process is known as what?

• A. Venous return
• B. Arterial flow
• C. Lymph drainage
• D. Pulmonary diffusion

Answer: (A)

The essential idea is how blood is brought back to the heart. When muscles contract, especially in the legs, they squeeze veins and push blood toward the heart. Vein valves prevent backflow, so this rhythmic squeezing effectively returns blood upward despite gravity. The overall process this describes is venous return, and the muscle-driven push is part of what makes venous return efficient—often called the skeletal muscle pump.

Other options refer to different systems: arterial flow is blood moving away from the heart through arteries; lymph drainage involves the lymphatic system; pulmonary diffusion is the exchange of gases in the lungs.