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36 Cards in this Set
- Front
- Back
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cell membrane |
sarcolemma |
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cytoplasm |
sarcoplasm |
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narrow tubes, continuous with the sarcolemma and extend into the sarcoplasm; help conduct action potentials (contraction signal) to the sarcoplasm |
transverse tubules (T tubules) |
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cylindrical sturcture that consists of myofilaments (consist of thin filaments and thick filaments); actively shorten; when they contract the entire muscle cell shortens ( how muscle contract to move objects) |
myofibril |
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protein filaments that are made of mostly actin (thin filaments) and myosin (thick filaments) |
myofilaments |
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similar to smooth endoplasmic reticulum; forms a tubular network around each myofibril; stores Ca2+ ions |
sacroplasmic reticulum |
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combination of 2 terminal cisternae and a transverse tubule |
triad |
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consists of thin filaments and thick filaments |
myofilaments |
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mostly actin |
thin filaments |
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myosin |
thick filaments |
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smallest fuctional units of muscle, muscle contraction comes from interactions of thick and thin filaments |
sarcomeres |
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*thick filament * thin filament *proteins that stabilize the position of thick and thin filaments *proteins that regulate the interactions between thick and thin filaments |
sacromeres |
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dark looking bands (remember--dark) toward the center of a sarcomere |
A bands |
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thin filament, proteins stabilize the positions of the thick filaments |
M line |
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area that contains thick filaments only |
H zone |
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area where thin filaments are found between the thick filaments |
zone of overlap |
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light colored bands (remember light) extend from A band to the next A band |
I band |
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boundary between sarcomeres; made up of connectins (proteins) |
Z lines |
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protein that extends from the tip of the thick filament to the attachment site at Z line' keeps thin and thick filaments in alignment; helps prevent extreme stretching |
titin |
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protein that make the intermediate filaments that surround Z line; interconnect sarcomeres |
desmin |
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What causes the banded appearance of skeletal muscle (striated mmuscle) |
the arrangement of Z lines and myofibrils |
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size of __________ is 5-6 nm in diameter and 1.6 um |
thin filaments |
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are attatched to the Z line |
Thin filaments |
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consist of F actin, tropomyosin, troponin |
thin filament |
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twisted strand of G actin globular molecules |
F actin |
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protein strands that prevent actin-myosin interaction by covering the active sites |
tropomyosin |
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made of three globular subunits |
troponin |
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locks the subunit to tropomyosin |
1st subunit of troponin |
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holds the troponon-tropomyosin complex in position |
2nd subunit of troponin |
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subunit has receptors to bind Ca2+ |
3rd subunit of troponin |
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a change in the position of troponin-tropomyosin complex that exposes the active sites of F actin is necessary... |
for a contraction to occur |
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diameter of 10-12 nm and length of 1.6um |
thick filaments |
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a pair of myosin molecules, each consisting of an elongate tail and a cross-bridge- blobular head that projects toward the thin fillament |
thick filament |
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1. H and I bands get smaller 2. zones of overlap get larger 3. Z lines move closer 4. width of A bands remains the same |
Sliding fillament theory |
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name the four steps to the sliding fillament theory |
1. H and I bands get smaller 2. zones of overlap get larger 3. Z lines move closer 4. width of A bands remains the same |
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The sliding filament theory explains how the relationship between thick and thin filament |
changes as the muscles and contractions shorten |
