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5 Cards in this Set
- Front
- Back
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Describe the development of skeletal muscle. Start from its germ layer.
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Mybolasts in mesoderm fuse to form myotubules
Nuclei in myotubules migrate to periphery Develop into myofibers that have peripherally located nuclei and most of cytoplasm filled with myofibrils |
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What is a syncitium? Give an example.
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multinucleated mass of cytoplasm that is not separated into individual cells
skeletal muscle arrangement |
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Describe the strength, speed, and whether contractions are voluntary in the three muscle types.
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Skeletal: strong, quick, discontinuous, voluntary
Cardiac: Strong, quick, continuous, involuntary Smooth: weak, slow, involuntary |
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Describe the layering of muscle fiber. Begin with the different terms for muscle fiber. Include all outer layers.
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Muscle fiber = myocyte = muscle cell (contains myofibrils made of myofilaments)
Muscle fiber wrapped in ENDOMYSIUM Fascicle is a bunch of muscle fibers Fascicle is wrapped in PERIMYSIUM Gross muscle is wrapped in EPIMYSIUM (superficial fascia) |
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What proteins are responsible for the striations in skeletal muscle? How?
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Arrangement of myosin (THICK FILS) and actin (THIN FILS)
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