LS 2 Review Sensory System

LS 2 Review Sensory System - LS 2 Review: Sensory System...

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LS 2 Review: Sensory System (Ch.45) I. Sensory Cells: (Receptor Cells) Transduce physical or chemical stimuli into signals that are transmittable and interpretable. Look like regular cells but behave like neurons a. Chemoreceptors: apply molecule to have response ex: tongue(nose) b. Thermoreceptors: temperature response. c. Nocireceptors: extreme pain (strong stimulus) d. Electroreceptors: respond to electrical fields. (not in humans) e. Magnetoreceptors: magnetic field changes. (not in humans) f. Mechanoreceptors: stimulated by movement, pressure. Ex. EAR and SKIN i. Skin: Found deeper in the skin. 1. Pacinian Corpuscles: provide information about vibrating stimuli of higher frequencies. (mechanoreceptor) 2. Dendrites of Sensory neurons- are also wrapped around hair follicles, which detect displacement of the hairs. 3. Receptor Acuity: Spatial Discriminative Receptors- know where stimulation occurs on skin via: a. Lateral Inhibition: area stimulated most sends inhibitory electrical signals IPSPs to sensory neurons next to it. (Meissner’s Corpuscle)
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ii. Sound: (Mechanoreceptors) 1. Sound is vibration of air molecules. 2. Waves of vibration: High Amplitude (loudness) & High Frequency (Pitch) 3. Sound is Transmitted:
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a. Vibration of air molecules go through the Pinna (funnel to direct air molecules), passing through external auditory canal . b.
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LS 2 Review Sensory System - LS 2 Review: Sensory System...

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