The Signal That Crosses a Synapse Is Stopped When

question 34

Multiple Choice

The signal that crosses a synapse is stopped when

• A)a second action potential traveling down the signaling cell "sounds a retreat," and the neurotransmitters return to the signaling cell.
• B)the responding cell runs out of sodium and is no longer able to respond to the stimulus.
• C)the responding cell runs out of potassium and is no longer able to respond to the stimulus.
• D)the neurotransmitter is enzymatically broken down or transported back to the signaling cell.

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Definitions:

Meganeura

An extinct genus of insects from the Carboniferous period, known to include some of the largest known flying insect species.

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The complex optical system found in vertebrates, composed of structures such as the lens, retina, and optic nerve, enabling vision.