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Natural painkillers produced by the brain that also contribute to feelings of pleasure, euphoria, and satisfaction.

A neurotransmitter that plays an important role in arousal, attention, memory, and motivation.

A hormone that regulates sleep-wake cycles, often called the "sleep hormone," as it helps control the body's circadian rhythms.

Known as the stress hormone, it regulates a wide range of processes throughout the body, including metabolism and the immune response, having a significant role in helping the body respond to stress.

Often referred to as the "love hormone," it is involved in social bonding, trust, and relationship-building.

The primary inhibitory neurotransmitter in the brain, known for its role in reducing neuronal excitability throughout the nervous system and promoting calmness.

A neurotransmitter and hormone that is important for attentiveness, emotions, sleeping, dreaming, and learning. It can also increase heart rate and blood pressure.

A goal is an idea of a future or perceived outcome that a person desires to envision, plan, and commit to achieve.

A neurotransmitter associated with the pleasure and reward system of the brain, encouraging us to engage in behaviors that are rewarding.

The most abundant excitatory neurotransmitter in the vertebrate nervous system, crucial for synaptic plasticity, the enhancement or weakening of synaptic transmission, and learning and memory.