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8 Cards in this Set
- Front
- Back
Muscle contraction
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ONLY contract, antagonistic muscles(ex: tricep and bicep)
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Muscle structure
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linear myofibrils -> linear muscle cells -> fascicles(bundle) -> muscle
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Muscle cells
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have plasma membrane, many nuclei.
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Sarcomeres
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sections of myofibrils bounded by a z line. Contains contractile proteins (thick actin and thin myosin)
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Contraction sequence
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1. electrical signal to neuromuscular juncture
2. Acetylcholine(ACh) released from axom bulb 3. Propagates electrical impulse w/in cell 4. Releases calcium ions from sarcoplasmic reticulum 5. Myosin heads bind w/ actin & bend (needs ATP) |
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ATP sources
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1.stored ATP
2. creatine phosphate 3. stored glycogen |
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Muscle activity
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isometric (tension, not contracting) vs. isotonic (contracting muscles)
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Muscle tension
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number of cells in motor unit, number of active neurons, frequency of stimulation
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