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Psychoactive Drugs
Drugs capable of influencing perception, mood, cognition, or behavior.
Neurotransmitters
Chemicals in the brain that transmit signals from one neuron to another across synapses.
Autonomic Nervous System
The part of the nervous system that controls involuntary bodily functions, such as heart rate, digestion, and respiratory rate.
Biological Rhythm
A periodic, more or less regular fluctuation in a biological system; it may or may not have psychological implications.
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