Pathologists save sections of each organ that is removed

answer:

Pathologists will preserve parts of any organs they dissect, particularly if they find something unusual or abnormal. Following examination, the organs are either returned to the body (minus the pieces preserved for future work or evidence) or cremated, in accordance with the law and the family's wishes.

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it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.