Linear approximations". In some types of neurons, the entire up-and-down cycle takes place in a few thousandths of a second. Molecules in Action. Histology Human eye anatomy Visual system Human cells Neurons. The helper lymphocytes are needed to activate both B and Tc lymphocytes which, even though they recognize extraneous agents, seldom enter into direct action. Pregnancy and Vaccines. The few ions that do cross are pumped out again by the continuous action of the sodium—potassium pump , which, with other ion transporters , maintains the normal ratio of ion concentrations across the membrane. See Fertility and Sterility, May , pp.
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