The Senses - Hearing Ear…Three Regions outer middle and...

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The Senses Detection of external stimuli: - conversion into an electrical signal via change in action potential - thermoreceptors - mechanoreceptors - chemo-receptors - nose, taste; internal environment: pH, blood oxygen - electromagnetic receptors (eyes) Vision - sclera – to – cornea - choriod – to – iris - pupil: opening in iris - lens - retina - fovea: retina’s center of focus (high concentration of photoreceptors) - Cones: stimulated by bright lights - see color, but not at night - fovea has high concentration of cones - pigment: photopsin (absorb bright light) - Rods: very sensitive to dim light - shades of gray - found mostly on periphery of retina (fovea has low concentration of rods) - pigment: rhodopsin (absorb dim light) - absorption of light changes pigment chemistry - alters membrane permeability - information is transmitted by an action potential to the brain
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Unformatted text preview: Hearing Ear…Three Regions: outer, middle and inner ears- pinna, auditory canal, eardrum- Eardrum receives sound and transmits to three bones in middle ear:- hammer (“malleus”), anvil (“incus”), stirrup (“stapes”)- Stirrup transmits sound waves to inner ear through “oval window”- Inner ear- cochlea: long coiled tube that contains the Organ of Corti- pressure waves in cochlea influence hair cells - hair cells are receptors- information: transmitted by an action potential to brain via auditory nerve Balance- regulated by semi-circular canals- base of each canal has a “cupula” – a gelatinous structure containing hair (sensory) cells- movement of hair cells communicates information about orientation to the brain Taste and Smell: Taste = molecules in solution; Smell = molecules in air...
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