KINE 304 Lecture Notes - Lecture 5: Afferent Nerve Fiber, Neural Pathway, Receptive Field
8 Apr 2017
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Document Summary
Secondary systems allow us to receive and interpret information from internal and external environments (sensory is a retrograde process) Each sensory system comprised of 3 major components: 1. Receptors sensitive to changes in environment: 2. Neural pathway carry information from receptor to brain: 3. Brain interprets sensory information (changes form sensations to perceptions: receptors specialized ells or specialized endings of afferent neurons. Thermoreceptors detect changes in temperature (hot and cold) Nociceptors pain receptors, detect tissure damage. Chemoreceptors detect taste, smell, oxygen, osmolarity, ph, etc. Transduction: regardless of original form of stimulus, it must be changed to electrical energy (occurs at receptor) Transduction: results in receptor potential, this is local graded potential. If receptor potential is of sufficient intensity by time of arrival at 1st node of ravier, will trigger action potential. Receptive field: are of body covered by receptors form single afferent neuron: *sensory unit: single afferent neuron and all of its receptors. Overlap of receptor fields also impacts acuity.
