Answer:
It will be endorphins
Explanation:
any of a group of hormones secreted within the brain and nervous system and having a number of physiological functions. They are peptides which activate the body's opiate receptors, causing an analgesic effect.
Under certain circumstances, bacteria can divide several times an hour. In ideal conditions, bacteria can divide around 100 times and produce millions of bacterial cells in a couple hours.
Could you explain what you are trying to find out