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CHAPTER 46 Sensory

CHAPTER 46 Sensory - CHAPTER 46 SENSORY SYSTEMS 3 classes...

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CHAPTER 46: SENSORY SYSTEMS 3 classes of environmental stimuli: 1. Mechanoreceptors: stimulated by mechanical forces Ex. Pressure, Gravity, Sound, Touch, Vibration 2. Chemoreceptors: stimulated by chemicals Ex. Taste Smell, Humidity 3. Photoreceptors: of the eyes, stimulated by electromagnetic and thermal energy Ex. Light, Heat, Electricity, Magnetism Exteroceptors: receptors that sense stimuli that arise in the external environment -Sensory systems enable the brain to construct a three-dimensional image of an object and its surroundings Interoceptors: sense stimuli that arise from within the body Receptor potential: a depolarization that occurs in a sensory receptor upon stimulation MECHANICAL AND CHEMICAL RECEPTORS Temperature and Pressure: Cutaneous receptors: interoceptors of the skin that respond to stimuli at the border between the external and internal environments Thermoreceptors: naked dendritic endings of sensory neurons that are sensitive to changes in temperature; cold and warm receptors
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