Question

how is the concentration of the product always kept within a certain range

Answer 1

Clarifying the question first - I assume that you are referring to Biology related product concentration maintenance since the question is in Biology field. 

This concept in the question is known as Feedback Inhibition. This works by deactivating an enzyme using the product of the reaction in which the enzyme is being used (here product is Enzyme). This is critical is preventing malfunction or serious diseases that can happen due to overproduction of enzyme and thus subsequent actions. 

Few uses of Feedback Inhibition:
- Avoids Energy Depletion
- Prevent overproduction

*If this helps, please mark as Brainliest*

Answer 2

In order to keep the concentration of the product in a certain range, it is monitored constantly and if there is some error being noticed in it, it is corrected as soon as possible.