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19 Cards in this Set
- Front
- Back
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Myastenia Gravis (MG)
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loss of ACh receptors; auto immune disease that affaects the binding site of ACh in muscle cells
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Rigor Mortis
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muscle "stiff as a board" immediately after death; cross bridge happened but there is no ATP for myosin to detach from actin
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Motor Unit
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a single motor neuron and all the muscle fibers it controls
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Twitch contraction
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complete cycle of stimulus-contraction-relaxation; has latent phase, contraction phase, and relaxation phase
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Wave Summation
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skips relaxation phase for as long as there is stimulus muscle fibers keep contracting; only happens to skeletal muscle fiber
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Treppe
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look like "stairs"; a gradual release of Ca++ will result in increasing response by the sarcomere
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Tetanus
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loss of relaxation phase; can be total which is complete loss of relaxation phase; incomplete which is producing almost peak tension
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Muscle tone
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postural muscle contracting at a level enough to generate tension to hold body in a certain position
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Isotonic
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force of contraction can overcome resistance; muscle is able to shorten; body is able to carry a certain object
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Isometric
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maximum muscle contraction but cannot overcome resistance; muscle is not able to shorten at maximum force; body cannot carry weight of object
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Synapse
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junction between neuron and another cell
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NMJ/Neuromuscular junction
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myoneuronal junction or the junction between a neuron and a motor cell
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Synaptic cleft
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narrow space that separates synaptic terminal and neuron from opposing sarcolemmal surface
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Synaptic knob
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round end of NMJ above synaptic cleft
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Neurotransmitter
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chemical substance made by neuron
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ACh/Acetylcholine
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a neurotransmitter released by NMJ
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AChE/Acethylcholinesterase
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an enzyme that breaks down ACh; only found in the synaptic cleft
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Cross bridge
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when myosin head binds with actin during contraction
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Cross bridge detachment
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when ATP binds with myosin and myosin detaches from actin
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