The human heart, composed of specialized muscle cells, beats to a specific rhythm. the heart cell rhythm partly depends on the opening and closing of series of gateways within the cell membrane, called ion channels. some channels let certain ions flow out, others let different ions flow in. the same membrane system is at work in other cells, to regulate what stays and what leaves the cell.
this cell membrane gateway system is specifically called the
a)
sodium-chlorine pump.
b)
hydrogen-oxygen pump.
eliminate
c)
sodium-potassium pump.
d)
calcium-potassium pump.