anatomy week 5: sarcomere

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10 Terms

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sarcomere

smallest unit of muscle contraction

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thin myo

anchored on one end to a Z-disk

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thick myo

anchord to Z-disk via titin and M line

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A-band

dark band, equal to length of thick myo

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H-zone

lighter band at center of A-band

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I-band

light band between adjacent A bands → actin, titin, Z-disk

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Z-disks

connection points between adjacent sarcomere

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M-line

supporting proteins holding thick myo together

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T-tubules

encircle myo at junctions of A and I bands

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number of actin myo to myosin myo 

2:1 ratio