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Tonic receptors:_______.
A) slowly decrease the frequency of action potentials generated to a constant stimulus.
B) are quick to adapt to a particular stimulus intensity.
C) will always decrease to the point where no action potentials are generated.
D) are attune to changes in a parameter, not the extent of that change.

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Answer:

A) slowly decrease the frequency of action potentials generated to a constant stimulus.

Explanation:

Tonic receptors slowly decrease the frequency of action potentials generated to a constant stimulus. These receptors are also called sensory receptor as they continue to produce action potentials over the duration of the stimulus.  Some of the tonic receptors are permanently active.

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