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Unformatted text preview: Review Questions Chapter 12 Answer Key 1. Imagine rubbing your finger across a pane of smooth glass and then across a brick. What kinds of skin receptors help you distinguish the two surfaces? As far as your somatic sensory system is concerned, what is different about the two surfaces? Smooth glass might produce a stimulus with no vibrations and no changes in pressure. To detect this surface, mechanoreceptors, such as Merkels disks or Meissners corpuscles, should be close to the surface of the skin. To be detected, the stimulus that glass creates would have to excite slowly adapting mechanoreceptors because its surface does not change. Merkels disks are slowly adapting and have small receptive fields. A brick might produce a stimulus with vibrations and changes in pressure related to the raised parts of its surface. This is a good stimulus for the Pacinian corpuscles and Ruffinis ending. To detect the successive peaks and valleys on the surface of the brick, a rapidly adapting receptor might best detect the stimulus. This requirement might make a Pacinian corpuscle the ideal receptor for stimulus....
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- Spring '08