RT Book, Section A1 Phillips, Raymond E. SR Print(0) ID 1175311984 T1 Calf Pump T2 Venous Insufficiency YR 2021 FD 2021 PB McGraw Hill PP New York, NY SN 9781260461268 LK accesscardiology.mhmedical.com/content.aspx?aid=1175311984 RD 2024/03/29 AB Robust calf muscles are essential for normal venous dynamics. Indeed, the grastrocnemius and soleus muscles in the calf have been described as a “physiological heart” comprising the main force propelling venous blood against gravity [1].