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BIOD27H3 (42)
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Chapter 10

Chapter 10 notes

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University of Toronto Scarborough
Biological Sciences

Chapter 10- Sensory Physiology - sensory stimuli whose processing reaches the conscious level of perception - these stimuli are those associated with the special senses of vision, hearing, taste, smell, and equilibrium - somatic senses; touch, temperature, pain, itch, and Proprioception - Proprioception; awareness of body movement and position in space is mediated by muscle and joint sensory receptors called proprioceptors and maybe unconscious or conscious General Properties of Sensory Systems - sensory pathways begin with a stimulus that is converted by a receptor into an electrical potential - if the stimulus is above threshold, action potentials pass along a sensory neuron to the CNS. We become aware of some stimuli but are never conscious of others. - Sensory receptors vary from free nerve endings to encapsulated nerve endings to specialized receptor cells - 4 types of sensory receptors based on stimulus to which they are most sensitive to; chemoreceptors, mechanoreceptors, thermoreceptors, and photoreceptors - Each receptor type has an adequate stimulus, a particular form of energy to which it is most responsive - A stimulus that is above threshold creates a graded potential in the receptor - Multiple sensory neurons converge on one secondary neuron and create a single large receptive field - Sensory information fro
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