Acetylcholine is the neurotransmitter responsible for muscle contraction and relaxation, as well as other functions such as memory and learning.

Dopamine is the neurotransmitter involved in reward, motivation, and pleasure, as well as other functions such as attention and focus.

Serotonin is the neurotransmitter involved in mood, sleep, and appetite, as well as other functions such as memory and learning.

Norepinephrine is the neurotransmitter involved in arousal, attention, and focus, as well as other functions such as mood and motivation.

Glutamate is the neurotransmitter involved in memory and learning, as well as other functions such as cognition and perception.

Substance P, endorphins, and enkephalins are all neurotransmitters involved in pain perception.

Hypothalamic-releasing hormones are the neurotransmitters involved in regulating body temperature and heart rate, as well as other functions such as sleep and appetite.

GABA is the neurotransmitter involved in regulating the release of other neurotransmitters, as well as other functions such as mood and anxiety.

Melatonin is the neurotransmitter involved in regulating sleep-wake cycles, as well as other functions such as mood and appetite.

Growth hormone-releasing hormone is the neurotransmitter involved in regulating growth and development, as well as other functions such as metabolism and reproduction.

Oxytocin is the neurotransmitter involved in regulating social behavior and bonding, as well as other functions such as reproduction and lactation.

Cortisol is the neurotransmitter involved in regulating stress responses, as well as other functions such as metabolism and immune function.

Dopamine is the neurotransmitter involved in regulating reward and punishment, as well as other functions such as motivation and attention.

Amygdala-releasing hormones are the neurotransmitters involved in regulating fear and anxiety, as well as other functions such as mood and motivation.

Ghrelin is the neurotransmitter involved in regulating hunger and thirst, as well as other functions such as metabolism and growth.