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This 2 page Class Notes was uploaded by Adrianna Elbon on Monday March 7, 2016. The Class Notes belongs to BIOL 1114, 001 at University of Oklahoma taught by Dr.Lee in Spring 2016. Since its upload, it has received 22 views.
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Date Created: 03/07/16
Chapter 27-Senses General senses- touch, temperature, pain Special senses- hearing, equilibrium, vision, taste, smell All senses can be received by hair receptors, touch, pain, temperature receptors (these are all free nerve endings). Receptor potentials are graded potentials that occur in sensory receptor cells Desensitization- 2 types: 1. Sensory adaptation- getting used to a constant stimulus over time, 2. Sensory receptors generate fewer action potentials under continuous stimulus. Proprioceptor- found in joints, muscles, and ligaments (could detect the stretch and sense position of the body parts). Chemoreceptor- smell, taste Photoreceptor- vision Mechanoreceptor- hearing, equilibrium Sense of taste is called gustation (we have 100-150 taste buds on each papillae in the mouth. Humans have about 10,000 total). The taste senses are sweet, salty, sour, bitter, and umami. Sodium causes depolarization H+ is sour (acidic) and can also cause depolarization How sweet something tastes=how well substances bind to sweet receptors. Smell (olfaction) - Air molecules get absorbed - Dissolve and get trapped in mucus - Attach to olfactory bulb - Olfactory receptor cells catch it first Vision: - Rod cells see black and white - Cone cells see color - Conospin and rhodopsin is activated by light molecules - Photoreceptors are in the back of the eye - Glasses help by changing the path of the light Hearing: - Eardrum vibrations vibrate and move 3 small bones in the ear (hammer, anvil, stirrup). - Sound moves to the cochlea - Vibrates the oval window - Moves liquid (the vestibular apparatus maintains equilibrium) - Semicircular canals detect rotating/tilting motions of the head - The utricle detects horizontal acceleration and head tilt (using gravity) - Saccule detects vertical acceleration