muscles - Skeletal Voluntary Striated Ca Cardiac...

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Skeletal Cardiac Smooth Voluntary Involuntary Involuntary Striated Striated Ca+ Ca+ Ca+ Excitation and contraction of a muscle cell: 1) An action potential in a motor neuron causes the release of acetylcholine, which depolarizes the muscle cell membrane 2) Transverse tubules depolarize the sarcoplasmic reticulum 3) Calcium is released and binds to the troponin complex 4) Tropomyosin shifts and unblocks the cross-bridge binding sites 5) The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP Muscle contraction: Acetylcholine muscle membrane voltage change calcium release from sarcoplasmic reticulum troponin exposes myosin binding sites Trace the sequence of events in muscle contraction from an action potential in a motor neuron to the relaxation of the muscle. A motor neuron releases acetylcholine into the synapse with a muscle, initiating an action potential within the muscle fiber, which spreads into the center of the cell along the
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muscles - Skeletal Voluntary Striated Ca Cardiac...

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