What is the primary function of the peripheral venous system?

The primary function of the peripheral venous system is to hold extra blood as a reservoir. The peripheral veins operate as a capacitance system, meaning they can accommodate varying volumes of blood as needed by the body. Approximately 70% of the total blood volume can be found in the venous system at any one time, and these veins can expand or contract to store extra blood, assisting with blood flow regulation and ensuring that there is an adequate supply available for the body's demands.

This reservoir function is crucial for maintaining blood circulation, especially during periods of increased physical activity or when the body requires more blood supply to specific organs. The ability of the venous system to adjust its volume and pressure plays a vital role in cardiovascular stability and efficiency.