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10 Cards in this Set
- Front
- Back
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What is the main function of muscle tissue?
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contraction to generate motion (muscle must span a joint to acheive this)
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What are triads
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Special internal membrane system called triads control
muscle contraction by regulating calcium release |
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Where is calcium stored?
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Ca is stored in sacs of sarcoplasmic reticulum
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What kind of muscle type moves voluntarily?
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skeletal muscle
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Where is smooth muscle found?
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-Found in larger blood vessels, the GI system, ureter, bladder, reproductive systems and many other locations
-Controls peristaltic motions of tubular structures |
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What distinguishing feature does cardiac muscle have?
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intercalated disk
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What does contractions involve?
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contraction involves repeated binding-movement-release cycles between the myosin heads and actin filaments
-The distance the actin filaments can travel during a single stroke is ~10 nm. Hundreds of cycles are necessary for full contraction |
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Why is calcium important?
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Calcium ions initiate contraction by binding to the helper protein troponin, which exposes the myosin binding site on actin.
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In specialized contractile cells, what are motile forces generated by?
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by the interaction of the proteins act and myosin (contractile proteins)
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What are skeletal muscles composed of?
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Skeletal muscle is composed of extremely elongated, multinucleate contractile cells, often described as muscle fibers
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