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Ch. 10 Part 1 Notes

Physiology 2420

QuestionAnswer
specialized neuronal structures that detect a specific form of energy in either the internal or external environment sensory receptors
conversion of the energy form of a stimulus into an electrical signal in the form of changes in membrane potential transduction
in the sensory system, the energy form of a stimulus modality
states that a given sensory receptor is specific for a particular energy form or stimulus type law of specific nerve energies
graded potential caused by the opening or closing of ion channels on sensory receptors, and triggered by sensory stimuli receptor potential
decreased responsiveness of a sensory receptor to a continued stimulus adaptation
receptors that decrease in responsiveness to a continuing stimulus phasic receptors (rapidly adapting receptors)
receptors that maintain responsiveness to a continuing stimulus tonic receptors (slowly adapting receptors)
a single afferent neuron and all sensory receptors associated with it sensory unit
an increase in the number of active neurons recruitment
process during which a stimulus that strongly excites receptors in a certain location inhibits activity in the afferent pathways of other receptors located nearby lateral inhibition
sensations that arise from receptors in the skin somesthetic sensations
the perception of the position of limbs and the body proprioception
sensory receptors that detect physical forces such as pressure or vibration mechanoreceptors
sensory receptors that detect temperature thermoreceptors
sensory receptors in the surface of the body that detect tissue-damaging stimuli nociceptors
ascending tracts that transmits sensory information from touch, pressure, vibrations, and proprioceptors to the thalamus dorsal column-medial lemniscal pathway
branch of the nervous system associated with perception of somatic sensations; associated with receptors in the skin and proprioception somatosensory system
somatosensory pathway that transmits information from thermoreceptors and nociceptors to the thalamus spinothalamic tract
a sharp, pricking sensation that can be easily localized and is produced by activation of nociceptors; is transmitted by A fibers fast pain
a poorly localized, dull, aching sensation produced by activation of nociceptors; is transmitted by C fibers slow pain
the perception of a painful stimulus as originating at a site on the body distinct from the location of the stimulus referred pain
Created by: GracieLou