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15 Cards in this Set
- Front
- Back
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functions fo muscle system
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1. moves skeleton
2. protection 3. maintains posture 4. generates 80% of body heat |
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shivering
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involuntary muscular contractions which occur when core body temp. drows to low
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Internal structure of muscle
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1. muscle as a whole
2. fascicles -bundles of fibers 3. fibers 4. myofibrils 5. myofilaments 6. sarcomeres |
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fibers
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1. actual cell o a muscle
2. microscopic 3. striated 4. have 100's of nuclei 5. run from tendon to tendon 6. voluntary or involuntary 7. sarcolemma- cell membrain 8. sarcoplasm- contents of cell(no nucleus) |
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myofibrils
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1. cylindrical structures that run the lenth of a fiber
2. 100's of these within each fiber 3. sarcoplasmic reticulum wraps around each myofibril; iternal circulatory system |
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myofilaments
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1. protein strands
2. 100's of these within each myfibrils 3. end view shows that they are surrounded by 6 actin in a hexagonal pattern 4. 2:1 ratio of actin to myosin 5. side view shows series of sarcomeres |
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types of myofilaments
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1. myosin
2. actin 3. titin |
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myosin
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thick
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actin
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thin
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titin
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anchors myosin to Z line/disc
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sarcomeres (side view, resting state
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1. contractile unit of a fiber
2. outlined by Z line/disc on each side 3. consists of overlapping actin and myosin 4. cylindrica section of a myofibril Z line/disc |
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Z line/disc
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consists of short protein that connect the actin from two adjoining sarcomeres
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sarcomeres (side view, resting state)
2a "A" band |
defined by the length of the myosin
Darker then I bands |
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sarcomeres (side view, resting state)
2a "I" band |
Purely actin from two adjoining sarcomeres
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sarcomeres (side view, resting state)
2a "H" band |
purely myosin in middle of sarcomere crossbridges- heads that emanate from myosin
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