Stimulants - but more probably catalyst.
Enzyme
1) Something that speeds up a chemical reaction but that is not changed by the reactions is called a catalyst.2)An element is a pure substance (not a compound) and while some elements (such as platinum) can speed up chemical reactions (eg platinum in a car exhaust catalytic converter), by far the most common catalysts are in fact compounds not elements. These compounds are organic in nature and called enzymes.
catalyst
The answer is catalyst. The question bugs me a little, because not all catalysts are elements. Some are compounds.
A substance that speeds the changing of food into a usable form* is called an enzyme. More generally, in any chemical context, a substance that speeds a reaction without itself being changed is called a catalyst._______________________________________*This changing of food into a usable form is called "digestion".
a catalyst
I believe you are looking for the term "accelerant." A catalyst.
Catalyst. And in cell it is enzyme
catalyst speeds up chemical change
Yes, a protein catalyst that speeds up chemical reactions in organisms is called an enzyme. Enzymes are involved in almost all cellular processes and play crucial roles in regulating biological reactions.
This substance is called catalyst; and in living systems it is an enzyme.
This is called a catalyst.