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The binding of the neurotransmitter __________ to its receptors on muscle cells causes a muscle to contract.
Heart Rate Acceleration
An increase in the speed of heartbeats per minute, which can occur due to exercise, stress, excitement, or medical conditions.
Amphetamine
A potent central nervous system stimulant, used medicinally and recreationally, which can enhance alertness and energy.
Unconditioned Stimulus
A stimulus that naturally and automatically triggers a response without prior conditioning in classical conditioning paradigms.
Conditioned Response
A learned response to a previously neutral stimulus that has been repeatedly presented along with an unconditioned stimulus.
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