Briefly describe the difference between tonic and phasic receptors, and illustrate this difference by sketching graphs showing any type of stimulus (as a rectangular wave), the receptor potentials generated by each type of receptor, and the resulting action potentials in the neurons that respond to each type of receptor. You do not need to put numbers on your axes; rather you are to demonstrate
you understand the relative differences in the responses.
What will be an ideal response?
Receptors adapt to stimuli at very different rates that are characteristic of a particular type of adaptation. Tonic receptors change very little over the duration of the stimulus. The extent of the change in membrane potential decreases a bit over time. Tonic receptors provide continuous information about a particular parameter. Phasic receptors adapt very quickly such that they turn off shortly after having been activated. A change in membrane potential over resting is quickly returned back to resting. These types of receptors provide information on regarding change in a parameter (not how much but just that they have changed). Graphs should resemble those in Figure
10.6 in the chapter.
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