these studies , performed on 3-week-old rats before the appearance of hypertension , showed , on the one hand , the existence of a na+ , k+ -atpase of very high affinity in the rat heart , and , on the other , that cardiac sarcolemmal membranes from shr had a greater number of sodium pumps than those from wky and thus a greater ability to extrude sodium .
C0001473
atpase
C0001479
sodium pumps