An Antagonist Is a Drug or Other Chemical That Blocks

question 165

True/False

An antagonist is a drug or other chemical that blocks areceptor site and inhibits or prevents a response in the receiving cell.

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Definitions:

Primary Neurotransmitter

A principal chemical substance released by neurons to transmit signals across synapses to other neurons or muscles.

Limbic System

A group of brain structures, including the amygdala, hippocampus, basal ganglia, and hypothalamus. Because these brain structures are associated more with emotion than with reasoning, the limbic system is often described as the “emotion brain” (in contrast to the cerebral cortex, which some have dubbed the “reasoning brain”).

Gray Matter

A major component of the central nervous system, consisting of neuronal cell bodies, dendrites, and unmyelinated axons, associated with processing and cognition.

Reward System

Areas of the limbic system associated with motivations to seek resources critical to individual and species survival, such as food, shelter, and sex.