The expression used to describe the pressure gradient in venous return is:

The expression used to describe the pressure gradient in venous return is:

• A. Venous pressure - Right atrial pressure / Venous vascular resistance
• B. Venous pressure - Right atrial pressure
• C. Right Atrial Pressure / Venous vascular resistance
• D. Venous Pressure

Answer: (A)

Flow in the venous system is governed by a pressure difference that drives blood back to the heart, and it is limited by the resistance to venous return. The driving force is the difference between the venous pressure and the right atrial pressure. The actual rate of venous return is this pressure difference divided by the venous vascular resistance. So the expression that describes the venous return gradient is (venous pressure − right atrial pressure) divided by venous vascular resistance. This captures both the push of blood toward the heart and the opposition from the venous system’s resistance.

Flow in the venous system is governed by a pressure difference that drives blood back to the heart, and it is limited by the resistance to venous return. The driving force is the difference between the venous pressure and the right atrial pressure. The actual rate of venous return is this pressure difference divided by the venous vascular resistance. So the expression that describes the venous return gradient is (venous pressure − right atrial pressure) divided by venous vascular resistance. This captures both the push of blood toward the heart and the opposition from the venous system’s resistance.