8. Painkilling chemicals (i.e. analgesics) that occur naturally in the body are known as "endorphins."
This term comes from the fact that these endorphins act like internal (endogenous) morphines (opiates).
So they shortened endogenous morphine to "endo - orphines" = endorphins.
The correct answer is:
A. TRUE
Immunity is your body's ability to destroy pathogens that it has previously encountered before the pathogens are able to cause disease.
