_____ receptors quickly adapt to a constant stimulus, meaning that action potentials decrease over time and eventually stop
Phasic
The receptors that quickly adapt to a constant stimulus are called phasic receptors. These receptors respond rapidly to changes in the stimulus but quickly adapt to a constant stimulus. As a result, the action potentials produced by the receptor decrease over time and eventually stop. This adaptation allows the receptor to be sensitive to new or changing stimuli, rather than continuing to respond to a constant stimulus.
Examples of phasic receptors include the receptors in the skin that respond to pressure and touch. When a person first puts on a shirt, they may feel the fabric on their skin, but after a few minutes, they no longer notice it. This is because the receptors quickly adapt to the pressure and touch stimulus and stop sending action potentials to the brain. This allows the brain to focus on other sensations that may be more important, such as the temperature of the room or the sound of a conversation.
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