"blank" filtration of the blood is called dialysis. 1. artificial 2. natural the circulatory system removes waste products from: a. blood b. cells c. blood and cells d. skin rh blood factor is determined by: a. the presence or absence of a particular leukocyte b. the presence or absence of a particular erythrocyte protein c. the presence or absence of a particular plasma d. the positive or negative characteristics of platelets