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22 Cards in this Set
- Front
- Back
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How muscles contract
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Muscle physiology
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Muscle system + nervous system
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Contraction
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Stimulus From the neuron sends an electrochemical signal to the muscle cells. Muscle cell transduces signal throughout fiber causing contraction.
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Excitation contraction coupling
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Leaky channels; no gate; slow process down.
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Passive channels
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Separate muscle & nerve cells from other cells.
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Active channels
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Cell changing charge & temporarily ending RP neg to pos
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Action potential
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Take cell charge change to open the gate
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Voltage Regulating Channels
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Chemical key binds to a receptor lock to open the gate.
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Chemical channels
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Terminal end of neuron,contains synaptic vesicles.
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Synaptic knob
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Contains chemically regulated vesicles
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Motor end plate
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Muscle tissue meets nerve tissue. Motor end plate of skeletal muscle + synaptic knob of neuron.
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Neruomuscular junction
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Bags that hold the neurotransmitters
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Synaptic vesicles.
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Thin filaments
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Actin
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large protein
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Troponin
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Rod shaped protein that spirals around actin and blocks myosin binding sites
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Tropomyosin
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Thick band
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Myosin
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Formed by myosin heads attaching to actin
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Crossbridge
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process of myosin heads attaching, detaching, reattaching further back on actin
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ratcheting
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going from positive to negative potential (relaxation)
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repolarization
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negative to positive resting to action
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depolarization
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What ends Rigor Mortis?
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Proteins breaking down crossbridges causing muscles to relax.
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Cause cramps & muscle fatigue
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Lactic Acid
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