chapter42%20-%20sensory%20systems%20_1_%20for%20online

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Sensory Systems Chapter 42
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Sensory Systems (Fig 42-1)
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Sensory Adaptation Human beings have five primary senses: sight, sound, smell, taste and touch. Sensory Adaptation occurs when sensory receptors change their sensitivity to a stimulus (ex pain)
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Visual Perception (Fig 42-2) Brain interprets sensations
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Sensory Receptors Classified by Location of Stimuli Exteroceptors monitor changes in the external environment Interoceptors monitor internal body conditions
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Sensory Receptors Classified by Type of Energy Thermoreceptors : specialized neurons designed to be sensitive to temperature variations within benign or normal range
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Pain Receptors (nociceptors) When sensory nerve fibers are exposed to extremes, they signal pain. Three types respond to extreme conditions: Release of neurotransmitters glutamate (acute) and substance P (chronic) ……stimulates an interneuron in the spinal cord….to the hypothalamus….and finally the brain centers (pain awareness)
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Electroreceptors Perceive electrical impulses; particularly common among aquatic creatures since salt water more efficient conductor than air
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Mechanoreceptors Sensory receptors that provide the organism with information about such mechanical changes in the environment as movement, tension, and pressure Convert mechanical energy into electrical energy, which in turn triggers a nerve impulse
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This note was uploaded on 03/08/2011 for the course BIO 119 taught by Professor Transue during the Spring '09 term at Rutgers.

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chapter42%20-%20sensory%20systems%20_1_%20for%20online -...

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