These substances are also called neurotransmitters.
an impulse
Hormone
Hormone
Hormone
Hormone
These substances are also called neurotransmitters.
products are produced after a chemical reaction.
An enzyme is a chemical produced by a living organism which acts as a catalyst in a biochemical reaction.
If the reaction is exothermic then heat is produced.
You have half answered this question for yoiurself ( produced) ; the answer is 'PRODUCTS'.
reactant elements and molecules are used in a chemical reaction, they are not mixed or combined or produced in a chemical reaction.
A product, by definition a product is produced by a chemical reaction.