Examlex
A _______________ is a regional polity in which two or more local groups are organized under a single authority figure at the head of a ranked hierarchy of people.
Brain Tissue
The collection of neurons, glial cells, and other components that make up the physical substance of the brain.
Lesion
Tissue destruction. A brain lesion is a naturally or experimentally caused destruction of brain tissue.
Neurotransmitter
Chemical substances in the nervous system that transmit signals from one neuron to another across synapses.
Agonist
A chemical or drug that binds to receptors in the brain and causes a reaction, often mimicking the action of naturally occurring substances.
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