What is the normal venous volume of the calf?

The normal venous volume of the calf typically ranges from 100 to 150 cc, making this the correct answer. This value is significant in the context of phlebology because it reflects the calf's capacity to accommodate blood flow during various physiological conditions. The calf muscles are critical in the venous return system as they act as a muscular pump, assisting in maintaining adequate venous return to the heart by helping to propel blood upwards against gravity. Understanding this normal volume is essential for sonographers when assessing venous conditions, as deviations from this norm may indicate venous insufficiency or other venous pathologies.