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What are the major roles of muscles in the body?
- 1. Body Movement
- 2. Movement of most materials through the body
- 3. Support
- 4. Generation of heat
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Muscle cells are made of ________.
Myofibrils
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Myofibrils are made of ________.
Myofilaments
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What are the three types of muscle contractions?
- 1. Isotonic
- 2. Isometric
- 3. Negative work
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Describe Isotonic muscle contractions.
Shorting of muscle against a constant load or force.
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Describe Isometric muscle contractions.
little or no contraction although muscle is acting against a force.
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Describe Negative work muscle contractions.
Muscle fibers elongate rather than contract as tension increases.
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Describe smooth muscle cells.
- They are enlongated, nonstriated, spindle shaped cells.
- They provide slow, sustained contraction. These cells contain single nucleus.
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Describe Unitary Smooth Muscle.
Occurs in most viscera, myogenic (Originating in muscle) contraction but modulated by nerve inpulses.
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Where is Multiunit smooth muscle found?
Blood vessels, eye, neurogenic.
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Describe cardiac muscle.
They are moderatly enlongated, striated and branching cells tightly united by intercalating discs. Myogenic modulated by nerve inpulse. One or more nuclei per cell.
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Discribe skeletal muscle.
Extremely long striated and multinucleated cells. Supports body and effects movement of the organism.
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