Thursday, February 4, 2010

Which of the following statements is false regarding muscle cells?

A. calcium ions are released as an action potential is propagated along a skeletal muscle cell B. Acetylcholine provides energy to propel actin filaments past myosin filaments during muscle cell activity C. calcium ions are actively collected and stored in the sarcoplasmic reticulum as the muscle returns to the resting state. D the interaction of acetylcholine with receptors on the sarcolemma may produce graded potentials E.tetanus is the normal mode of contraction in human muscle cellsWhich of the following statements is false regarding muscle cells?
B. it is ATP that provides energy for movement of mucle fibres not Acetylcholine. Acytelcholine is released from the nerve and binds to receptors on the cell surface to initiate the spread of action potential along the muscle cell surface.





in this case Tetanus refers to a normal physiological process. Tetanus can either refer to a disease process that causes paralysis or in the case of normal physiological function it refers to a process whereby multiple action potentials occur in rapid succession so that the muscle remains stimulated and thus remains contracted. this results in a maximal sustained contraction (called tetanus). without this process a steady contractile force could not be produced in tissue.

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