Question

the neurotransmitter ______ is involved in pain suppression and pleasurable feelings.

○ glutamate

○ endorphin

○ acetylcholine

○ gaba

Explanation:

Endorphins are neurotransmitters that act as natural painkillers and are associated with pleasurable feelings (e.g., during exercise or positive experiences). Glutamate is an excitatory transmitter, acetylcholine is involved in muscle action and memory, and GABA is inhibitory. So endorphin matches the role.

Answer:

B. endorphin