BIOB34H3 Lecture Notes - Sliding Filament Theory, Myocyte, Skeletal Muscle

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20 Mar 2013
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3 types of muscle: skeletal (striated, voluntary, multinucleate, movement of whole body or parts, cardiac (striated, involuntary, one nucleus, pump blood, smooth (unstriated, involuntary, one nucleus, movement of substances through hollow organs, skeletal muscle. Muscles accomplish work (force x distance), but most of the energy muscles use (about 75%) converted to heat. Lever systems: muscles provide force to move bones (levers) around joints (fulcrum, depending on construction of system, allows a given effort to move a heavier load, or to move it farther and faster, skeletal muscle metabolism. Muscle cells have enough atp reserves to last 4-6 seconds of strenuous activity. 3 ways to form atp: creatine phosphate, contains high energy phosphate group. Oxygen debt: oxidative phosphorylation allows restoration of energy reserves, breaks down lactic acid, replenishes stores of creatine phosphate and glycogen, takes minutes to whole day, fiber types.

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