Abstract
Under physiological conditions, the activity of calcium, that is, the concentration of free ionized calcium (Ca2+) in the cytosol of human red cells, is less than 10-7 M, which is about 104 times lower than that present in the blood plasma (see Rega and Garrahan, 1986). Although the passive permeability of the red-cell membrane to Ca2+ is very low, there is a small but permanent leak of Ca2+ into the cell. Hence, active transport of Ca2+ to the extracellular medium is required to maintain the low concentration of Ca2+ in the cytosol.
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Rega, A.F., Garrahan, P.J. (1989). Catalytic Mechanisms of the Ca-Pump ATPase. In: Raess, B.U., Tunnicliff, G. (eds) The Red Cell Membrane. Contemporary Biomedicine, vol 10. Humana Press. https://doi.org/10.1007/978-1-4612-4500-1_6
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