Final answer:
The three types of endogenous opioids are Endorphins, Enkephalins, and Dynorphins, which are natural painkillers produced by the body.
Step-by-step explanation:
The correct answer to the question about the three types of endogenous opioids is Option 1: Endorphins, Enkephalins, and Dynorphins. These opioids are produced naturally within the body and play a key role in reducing pain and producing euphoria. They are distinct from biogenic amines such as dopamine, serotonin, and norepinephrine, which have their own roles as neurotransmitters with mixed excitatory and inhibitory effects, and are not classified as opioids. Additionally, Option 3 lists neurotransmitters, and Option 4 lists hormones which are important peptides, but neither list contains endogenous opioids.