Examlex
The egg is propelled down the oviduct by
Antagonist
A substance that blocks or inhibits the effects of a neurotransmitter or hormone.
Opiate
A group of drugs derived from opium, used for pain relief, but also associated with addiction and dependence.
Excitatory Messages
Neurological signals that increase the likelihood of a neuron firing and thus stimulate action in the nervous system.
Inhibitory Message
A neurological or psychological signal that reduces or prevents certain actions, thoughts, or feelings.
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