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My_Ch49_lecture(2009050122183138) - Chapter 49 Sensory...

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Chapter 49: Sensory & Motor Purpose—to understand the types of sensory receptors, and the components of the musculoskeletal system What you MUST know in Ch 49: Types of sensory receptors Overview of ear structure Structure of the eye Sensory transduction in the eye Types of skeletons Vertebrate skeletal muscle Sliding filament contraction Cardiac, smooth, vs. striated muscle Types of Sensory Receptors : Categorized by the type of energy they detect (= sensory transduction): 1. Mechanoreceptors —stimulated by physical stimuli, mechanical energy. Stimuli result in increased permeability to Na + and K + ions, resulting in depolarization of the mechanoreceptor cell membrane. Pressure Touch Stretch (muscle spindle) Motion (hair cell) Sound 2. Pain receptors (= nociceptors) respond to pain (heat, pressure) or chemical signals from damaged or inflamed tissues (histamine, acids). 3. Thermoreceptors respond to heat or cold (skin and core body temp)
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4. Chemoreceptors respond to individual chemicals. Include taste (= gustatory) and smell (olfactory) receptors) 5. Electromagnetic receptors detect light, electricity, and magnetism. Includes photoreceptors (in eyes); migratory animals use magnetic field receptors Eye anatomy http://www.nei.nih.gov/health/eyediagram/ http://www.stlukeseye.com/Anatomy.asp and Campbell’s pages 997-1002—look at the pictures! Cornea —lets light into the eye; acts as fixed lens Iris —by changing its size, regulates the amount of light entering the pupil Lens —focuses entering light image on the retina , which contains the photoreceptor cells , which are: Rods
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