Examlex
For many students, academic achievement _____ and behavioral problems increase during middle school.
Neurotransmitter
Chemical signal released by axon terminals of a neuron.
Endorphins
Naturally occurring peptides produced in the brain that act as neurotransmitters to reduce the perception of pain and promote feelings of pleasure.
Morphine
An opiate analgesic derived from the opium poppy used for pain relief.
Sympathetic Systems
A part of the autonomic nervous system responsible for the body's 'fight or flight' response to stressful situations.
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