Term
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Definition
| Comprised of fascicles = muscle fibers (cells) = myofibers |
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Term
| Skeletal Muscle Attachments |
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Definition
DR CT -- 2 forms:
tendons and aponeuroses |
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Term
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Definition
| What muscles are surrounded by |
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Term
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Definition
| What fascicles are grouped and surrounded by |
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Term
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Definition
| Muscle fibers are wrapped in this |
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Term
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Definition
| Each fiber is composed of this |
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Term
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Definition
| each myofibril is composed of this |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| endoplasmic plasmic reticulum -- store calcium ions and releases these ions as needed for muscle contraction |
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Term
| transverse tubules (t-tubules) |
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Definition
| can conduct a nerve impulse rapidly from the sarcolemma to interior of muscle cell |
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Term
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Definition
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Term
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Definition
| thick and thin myofilaments overlapping |
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Term
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Definition
| dark line in the middle of an I-band |
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Term
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Definition
a lighter, central region in the middle of a dark a-band
only thick myofilaments |
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Term
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Definition
| runs from z-line to z-line (functional contractile unit) |
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Term
| sliding filament model of contraction (7 steps) |
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Definition
1. nerve impulse carried from brain/spine cord to muscle by axon of motor neuron
2. axon meets muscle fiber at the neuromuscular junction
3. axon releases a chemical neurotransmitter called acetylcholine (ach), which binds to sarcolemma
4. a nerve impulse is generated and it passes down the t-tubulse -> result sarcoplasmic reticulum releases calcium ions into sarcoplasm
5. calcium ions bind to thin myofilaments (helps thick attach to thin)
6. myofilaments slide over one another; sarcomere shortens; muscle contracts
7. when the nerve impulse stops, ca++ return to the S.R. and the myofilaments slide back to resting state |
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