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LS2 Lec 9 Sensory (2 Slides)

LS2 Lec 9 Sensory (2 Slides) - Life Sciences 2 Sensory...

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1 Life Sciences 2 Sensory Systems Chapter 45 Dr. Jospeh Esdin Sensory Cells and Transduction of Stimuli Sensory cells transduce physical or chemical stimuli into signals that are transmittable and interpretable Most sensory cells (or receptor cells ) are modified neurons, specialized for detecting different kinds of stimuli, such as pressure, heat, or light.
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2 Types of Receptors • Photoreceptors • Mechanoreceptors • Chemoreceptors • Thermoreceptors • Nocireceptors • Electroreceptors • Magnetoreceptors Rods & Cones Hair Cell Olfactory Neuron Pacinian corpuscle Types of Sense Cells
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3 Mechanoreceptors Mechanoreceptors are found deeper in the skin: Pacinian corpuscles provide information about vibrating stimuli of higher frequencies Dendrites of sensory neurons are also wrapped around hair follicles, which detect displacement of the hairs Pacinian corpuscle Sensory in the Skin Nerve fiber Epidermis Dermis
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4 Pacinian Corpuscle Axon of afferent neuron Connective tissue layers Pacinian corpuscle Dendrite Receptor Acuity Receptive Field Size Stimulate less Stimulate less Stimulate most
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5 Receptor Acuity Transmission continues Transmission stopped Transmission stopped Sound Sound is the vibration of air molecules Waves of vibrations can have – High amplitude (loudness) – Frequency (pitch)
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6 Pinna External auditory canal Tympanic membrane Malleus Incus stapes Oval window Semicircular canals Cochlea Round window Auditory tube How Is Sound Transmitted? How Is Sound Transmitted? Vibration of air molecules go through the pinna, passing through the external auditory canal The air then vibrates the tympanic membrane which cause the three ossicles to vibrate
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7 How Is Sound Transmitted?
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