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15 Cards in this Set
- Front
- Back
What is a muscle fiber?
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A muscle cell
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Muscle cells are also called by what name?
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Muscle fibers
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What is a sarcomere?
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The functional unit of a muscle fiber. It extends from one Z disc to the Z disk of an adjoining sarcomere.
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Which filament is thick in a myofibril?
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Myosin
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Which filament is thin in a myofibril?
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Actin
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Where is the M line found?
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In the middle of the A band
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What is the A band?
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The band that extends the full length of myosin.
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What is the H band?
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The region between two actin fibers.
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What is the I band?
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The region between two myosin fibers?
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Where is the Z line found?
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At the center of the I band.
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What composes a motor unit?
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Skeletal muscle cells and the single neuron that innervate them.
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What is the neurotransmitter found in a motor unit?
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ACh
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What is the function of a muscle spindle?
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Monitor the length and changes in length (tension) of muscles.
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What are some characteristics of cardiac muscle?
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1) Involuntary action
2) Intercalated discs |
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What are some characteristics of smooth muscle?
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1) No striations
2) Spindle-shaped cells |