unit 1.3a 2nd

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Vocabulary flashcards covering key terms related to neurotransmitters, drug actions, and the endocrine system.

Last updated 3:43 AM on 9/22/26

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Endorphins [en-DOR-fins]

"morphine within"; natural, opioid-like neurotransmitters linked to pain control and to pleasure.

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Agonist

A molecule that increases a neurotransmitter's action.

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Antagonist

A molecule that inhibits or blocks a neurotransmitter's action.

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Endocrine system [EN-duh-krin]

The body's "slow" chemical communication system; a set of glands and fat tissue that secrete hormones into the bloodstream.