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Receptor

Protein structure, usually on the outside of a cell membrane, that binds another molecule (eg: hormone, metabolite, nutrient) to facilitate the movement of the molecule across the membrane and/or the instigation of chemical reactions inside the cell.

Reduced

When a molecule gains electrons through reduction.

Reduction

The chemical process where a molecule gains electrons.

RER

Respiratory exchange ratio = VCO2/VO2.
 
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