Morphine,heroin,and Codeine Are Effective Because They Imitate the Action of Our

question 42

Multiple Choice

Morphine,heroin,and codeine are effective because they imitate the action of our natural ____.

• A)excitatory neurotransmitters
• B)tryptamines
• C)endorphins
• D)catecholamines

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Definitions:

Synapse

The junction between two neurons or a neuron and a muscle where signal transmission occurs.

Presynaptic Terminal

The end of a nerve fiber where neurotransmitters are released to signal to the next neuron across a synapse.

Synaptic Cleft

The gap between two nerve cells across which neurotransmitters are released to transmit nerve impulses.

Postsynaptic Membrane

The cell membrane opposite the synaptic cleft that receives and responds to neurotransmitters from the presynaptic neuron.