Lecture 4 - Sensory Mechanisms-Updated

4 sensory receptor specialized sensory neurons that

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Unformatted text preview: tradi6onal” senses: –  Touch, Smell, Taste, Hearing and Vision 3 Sensory Mechanisms •  The nervous system controls the flight versus fight response •  How the nervous system is able to respond to the environment? 4 Sensory receptor •  Specialized sensory neurons that detect a par6cular s6muli – not only the receptors •  When response is strong enough an ac6on poten6al is sent to CNS 5 Strong vs weak s6mulus •  Strength of the s6mulus is indicated by the frequency of ac6on poten6als sent to the CNS (firing rates) 6 Adapta6on •  AOer a while receptors can be desensi6zed 7 Types of Sensory receptors •  Mechanoreceptors •  Thermoreceptors •  Nociceptors (pain receptors) •  Electromagne6c receptors –  Photoreceptors •  Chemoreceptors •  Electroreceptors 8 Mechanorecep6on •  Mechanical energy •  Detects deforma6on of membrane produced by touch, stretch, pressure, mo6on, and sound •  S6muli open ion channels in the plasma membrane, which depolarizes the cell •  Mechanoreceptor can be a neuron or a specialized epithelial cell 9 Mechanorecep6on •  Stretch receptors –  Commonly found in the walls of organs that can be distended •  Stretching in stomach is interpreted as fullness –  In muscle, stretch receptors modi...
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