142. endogenous compound Components naturally present in biological fluids obtained from animals or humans.
143. end point A
predetermined
point
precisely
defined
to
which
a variable must reach, in order to conclude an experiment.
144. enzyme Catalytic proteins that speed up the rate of a chemical reaction or enable the conversion of one chemical to another in a living organism.
145. enzyme induction The increase in the rate of enzymatic processes resulting in faster metabolism of a compound, usually caused by repeated treatments with an inducing molecule. If a drug stimulates its own metabolism, this is called autoinduction.
146. enzyme inhibition The decrease in the rate of metabolism of a compound usually caused by competition for binding to an enzyme system responsible for metabolism of the compound.
