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Mechanics and energetics of contraction in striated muscle of the sea scallop, Placopecten magellanicus.
Author(s) -
Rall J A
Publication year - 1981
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1981.sp013984
Subject(s) - scallop , isometric exercise , energetics , adductor muscles , contraction (grammar) , anatomy , muscle contraction , biology , medicine , chemistry , fishery , endocrinology , ecology , physiology
1. Mechanics and energetics of contraction in the striated adductor muscle of the sea scallop, Placopecten magellanicus, were determined and compared to a more conventional muscle preparation, the semitendinosus muscle of the frog, Rana pipiens. Experiments were conducted at 10 degrees C. 2. Scallop and frog striated muscle exhibited similar isometric twitch kinetics, heat coefficients (ratio of force produced to energy liberated), and twitch to tetanus ratios. 3. There were significant differences between scallop and frog muscle in that scallop muscle demonstrated a 30% lower isometric force, an inability to maintain force during a tetanus, and a transient decrease in economy of force development in a twitch after a tetanus, i.e. a decrease in the isometric heat coefficient.