The is what needs to be overcome in a reaction so that it can proceed to the products.

The answer to this question would be: activation energy

Activation energy is the energy needed for the chemical reaction to occur. The energy can be written as KJ/mol or kkcal/mol. This activation energy can be lowered by adding a catalyst which in turn increases the reaction rate

Lorraine and Albert are discussing neurotransmitters while getting ready for an exam. Lorraine maintains that dendrites receive and sort both excitatory and inhibitory messages. [ Albert, on the other hand, argues it is endorphins that complete the selection process. Lorraine is correct. ]