Senses - stimulus/action potentials The most adaptable...

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Senses | Input to the nervous system is in the form of our five senses: pain, vision, taste, smell, and hearing. Vision, taste, smell, and hearing input are the special senses. Pain, temperature, and pressure are known as somatic senses . Sensory input begins with sensors that react to stimuli in the form of energy that is transmitted into an action potential and sent to the CNS. Sensory Receptors Sensory receptors are classified according to the type of energy they can detect and respond to. Mechanoreceptors: hearing and balance, stretching. Photoreceptors: light. Chemoreceptors: smell and taste mainly, as well as internal sensors in the digestive and circulatory systems. Thermoreceptors: changes in temperature. Electroreceptors: detect electrical currents in the surrounding environment. Mechanoreceptors vary greatly in the specific type of stimulus and duration of
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Unformatted text preview: stimulus/action potentials. The most adaptable vertebrate mechanoreceptor is the hair cell. Hair cells are present in the lateral line of fish. In humans and mammals hair cells are involved with detection of sound and gravity and providing balance. Hearing Hearing involves the actions of the external ear, eardrum, ossicles, and cochlea. In hearing, sound waves in air are converted into vibrations of a liquid then into movement of hair cells in the cochlea. Finally they are converted into action potentials in a sensory dendrite connected to the auditory nerve. Very loud sounds can cause violent vibrations in the membrane under hair cells, causing a shearing or permanent distortion to the cells, resulting in permanent hearing loss....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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