BIO 242 Lecture Notes - Lecture 6: Middle Ear, Oval Window, Otolith

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The peripheral nervous system (pns) consists of nerve fibers that carry information between the cns and other parts of the body. A stimulus is a change detectable by the body. Modalities of input refer to the different forms of energy such as heat, light, sounds, pressure, and chemical changes. When stimulated, receptors produce graded potentials called receptor potentials in the receptor; this conversion of stimulus energy into receptor potentials is called sensory transduction. Receptor potentials trigger action potentials in afferent fibers. Each receptor will respond to one type of stimulus and can be categorized according to this responsiveness. Mechanoreceptors are sensitive to mechanical energy such as stretch and pressure. Osmoreceptors detect changes in solute concentration in the ecf. Nociceptors (pain receptors) are sensitive to tissue damage such as cutting, tearing, or burning. The cns can process inputs from several different types of simultaneously activated primary receptors to produce an integrated sensation such as wetness (touch, pressure, and thermal receptor inputs).

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