PHYSIOL 335 Study Guide - Midterm Guide: Afferent Nerve Fiber, Stimulus Modality, Receptive Field
Document Summary
Lecture nine, ten, and eleven: define stimulus modality. Another term for stimulus type (heat, cold, sound, pressure, etc. : with regard to sensory receptors, define adequate stimulus and cite a specific example. Graded potential that arises in afferent neuron ending, or a specialized cell intimately associated with it, in response to stimulation. Action potentials originate at the first node of ranvier: true or false: increasing the magnitude of a receptor potential increases the amplitude of action potentials in the associated afferent neuron. The distinct pathways are called labeled lines: with regard to sensory receptors, define acuity, and list at least three factors that account for the variation in acuity to stimuli in different body regions. Sharpness or keenness of perception; precision of localizing stimulus; the amount of convergence of neuronal input in the specific ascending pathways: the greater the convergence, the less acuity. It is an important mechanism enabling the localization of a stimulus site.
