. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 582 Comparative Animal Physiology widths of A to I bands approaches 1 in faster muscles and is much less than 1 in slower muscles.^^ In crabs the striation widths exceed 10 fi but tend to be narrower in the faster muscles of a given individuals^® The contractile proteins are distributed throughout the. fiber, hence the material of the striations is not concerned directly with contraction, and there is no clear explanation of why striated muscle is faster than D B â 3 iy Vi Anisotropic band Isotro
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 582 Comparative Animal Physiology widths of A to I bands approaches 1 in faster muscles and is much less than 1 in slower muscles.^^ In crabs the striation widths exceed 10 fi but tend to be narrower in the faster muscles of a given individuals^® The contractile proteins are distributed throughout the. fiber, hence the material of the striations is not concerned directly with contraction, and there is no clear explanation of why striated muscle is faster than D B â 3 iy Vi Anisotropic band Isotropic band Sarcolennma --»v "w » «i»"«4 !fPl W"i W"*" ;' ' - !r"i Vi '-' u ,.. ., Nucleus I Tonus fibrils I Fig. 217. Views of muscle fibers: fibers of longitudinal retractor muscles of Thy one: longitudinal sections, A, in relaxed, and B, in contracted state; C, cross section in relaxed state. No striations, no fibrils, much connective tissue. ;^ D, Portion of muscle fiber from heart of Ciona. Striated on one side, non-striated on other side. ; Muscle striations are usually less sharp in vertebrates than in arthropods, sarcomere lengths are usually 2-3 jx, and in isotonic contraction they may sometimes be reduced to half this length. In amniotes and in some fish, striated muscle may be white or red. The color is less important than are other characters; in white muscle the fibrils are close together and abun-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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