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29 Cards in this Set
- Front
- Back
Large Multinucleate Striated |
Skeletal muscle fibers |
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Striated Smaller and branched Uninucleate Have intercalated disks |
Cardiac muscle fibers |
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Brings bones together |
Flexor |
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Moves bones away |
Extensor |
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Stores calcium used for muscle contraction |
Sarcoplasmic reticulum |
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Extensions of the cell membrane that associate with the ends of the sarcoplasmic reticulum |
T-tubules |
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Thick filaments are made of |
Myosin |
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Thin filaments are made of |
Actin |
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For elasticity and stabilization |
Elastin |
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Only myosin segment of the sarcomere |
H-zone |
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Area of actin only |
I-band |
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Actin and myosin overlap |
A-band |
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Force created by muscle |
Muscle tension |
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Weight or force opposing contraction |
Load |
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Creation of tension in muscle |
Contraction |
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Release of tension |
Relaxation |
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High energy storing molecule |
Phosphocreatine |
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Rely primarily on oxidative phosphoylation (marathon runners) |
Slow-twitch fibers |
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Develop tension faster (sprinters) |
Fast-twitch fibers |
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Rely primarily on anaerobic glycolysis |
Fast-twitch oxidative glycolytic fibers |
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Use oxidative and glycolytic metabolism |
Fast-twitch oxidative-glycolytic fibers |
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Consists of one motor neuron and all the muscle fibers it innervates |
Motor unit |
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Contractions that create force and move a load |
Isotonic contractions |
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Contractions that create force without moving a load |
Isometric contractions |
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Relaxed normally but contract when we want them to |
Phasic smooth muscles (esophagus) |
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Usually contracted but relaxes when needed |
Tonic smooth muscles (bladder) |
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Connected by gap junctions, and the cells contract as a single unit |
Single-unit smooth muscle cells |
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Are not electrically linked, and each cell must be stimulated independently |
Multi-unit smooth muscle cells |
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Slowest type of cells to contract and relax |
Smooth muscles |