Final answer:
Fast-adapting receptors are called phasic receptors. These receptors quickly adapt to stimuli and detect changes in the stimulus.
Step-by-step explanation:
Fast-adapting receptors are called phasic receptors. These receptors are sensory receptors that rapidly adapt to stimuli and are involved in detecting changes or dynamic aspects of the stimulus. For example, Meissner's corpuscles are phasic receptors that detect light touch and low-frequency vibration.