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Tonic (physiology) : ウィキペディア英語版 | Tonic (physiology)
Tonic in physiology refers to a physiological response which is slow and may be graded. This term is typically used in opposition to a fast response. For instance, tonic muscles are contrasted by the more typical and much faster twitch muscles, while tonic sensory nerve endings are contrasted to the much faster phasic sensory nerve endings. ==Tonic muscles== Tonic muscles are much slower than twitch fibers in terms of time from stimulus to full activation, time to full relaxation upon cessation of stimuli, and maximal shortening velocity.〔Kardong, K. 2008. Vertebrates: Comparative Anatomy, Function, Evolution. 5th edition. McGraw-Hill Science/Engineering/Math. ISBN 978-0-07-304058-5〕 These muscles are rarely found in mammals (only in the muscles moving the eye and in the middle ear), but are common in reptiles and amphibians.〔
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