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Searchable A-Z glossary of biology and anatomy terms — clear definitions written for students at every level.
Electrical impulse along a neuron triggered when sodium ions rush into the cell.
PhysiologyTiny air sacs in the lungs where gas exchange occurs — oxygen in, carbon dioxide out.
AnatomyProtein produced by B cells that binds specifically to antigens to neutralize pathogens.
ImmunologyAdenosine triphosphate — the primary energy currency of cells, produced during cellular respiration.
Biochemistry