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Sensory and Motor Mechanisms

pages 1087-1117

Lauren Eller

on 26 April 2010

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Transcript of Sensory and Motor Mechanisms

Double click anywhere & add an idea Sensory and Motor Mechanisms
Chapter 50 Topics 50.1 Sensory Receptors
50.2 Mechanoreceptors-hearing and equilibrium
50.3 Taste and Smell
50.4 Vision
50.5 Muscle function
50.6 Skeletal Systems and Locomotion 50.1 Sensory Receptors Types of Sensory Receptors Sensory Pathways 1. Reception

2. Transduction
3.Transmission 4.Perception 5.Amplification 6. Adaptation Mechanoreceptors Chemoreceptors Electromagnetic Thermoreceptors -conversion of physical or chemical stimulus to a change in receptor potential of a sensory receptor -detection of a stimulus by sensory cells(sensory receptors) dectect external (heat, light, pressure, and chemicals) and internal stimuli (blood pressure and body position) -information is transmitted through the nervous system in the form of action potentials. -(color, smell, sound, and taste)are constructions formed in the brain and do not exist outside of it -decrease in responsiveness
so you are not constantly aware of feeling everybit of clothing on your body -strengthing of stimulus energy during transduction mechanical energy (touch, pressure, stretch, motion, sound) ion channel permeability results in depolarization or hyperpolarization Ex. crayfish: When muscle is streched, the spindle fibers are stretched, depolorizing sensory neurons and triggering action potentials that are transmitted to spinal cord
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