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Also known as adrenaline, it increases heart rate, muscle strength, blood pressure, and sugar metabolism. It is both a hormone and a neurotransmitter.

Known as natural painkillers, they are involved in pain reduction and feeling good, or the 'runner's high'.

This neurotransmitter acts as a hormone and is best known for its roles in sexual reproduction, maternal behaviors, and social bonding.

Plays roles in reward, motivation, memory, attention, and even regulating body movements.

A neuropeptide involved in the transmission of pain, stress responses, and inflammation.

Involved in muscle contraction, learning, and memory. It is the chief neurotransmitter of the parasympathetic nervous system.

Plays a role in pain, appetite, memory, and motivation. It's an endocannabinoid that binds to cannabinoid receptors.

Regulates mood, appetite, and sleep. Also involved in cognitive functions like memory and learning.

Involved in the immune response, regulates physiological function in the gut, and acts as a neurotransmitter for the brain, spinal cord, and uterus.

The primary inhibitory neurotransmitter in the brain, it plays a role in reducing neuronal excitability throughout the nervous system.

Acts as both a hormone and a neurotransmitter. It's important for attentiveness, emotions, sleeping, dreaming, and learning.