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BIO 309D S08 Lec8 - Sensory Mechanisms Sensory Pathways...

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Sensory Mechanisms
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Sensory Pathways Convey information about the external and internal environment to the brain (the cerebrum)
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Sensory Pathways Sensory reception Detection of a stimulus by sensory receptor Sensory transduction Conversion of a physical or chemical stimulus into an electrical signal 11(action potentials) Sensory transmission Information is passed to the CNS Sensation Awareness of the stimulus Depends on which part of the brain receives information Intensity of stimulus Perception: attaching meaning to the sensation
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Types of sensory receptors Structure specialized to respond to a specific type of stimulus Some sensory neurons are sensory receptors Some are not neurons but specialized epithelial cells - must pass the info they receive to a sensory neuron Classified according to the stimulus to which they respond 5 classes
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Types of Sensory Receptors Mechanoreceptors Thermoreceptors Photoreceptors Chemoreceptors Pain receptors
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Type of Sensory Receptors Mechanoreceptors Respond to physical deformation/distortion in receptor Important for touch, for pressure, and for hearing
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Types of Sensory receptors Thermoreceptors Respond to temperature
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Types of sensory receptors Photoreceptors Respond to light Very important in vision
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Types of sensory receptors Chemoreceptors Respond to the binding of chemicals Associated with taste Also responsible for odor
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