For Quiz Bowl
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| Muscle Fibers | show 🗑
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| show | Comprised of sarcomeres
Usually 1-2 micrometers in diameter
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| show | Comprised of thick and thin filaments
Thick (Myosin)
Thin (Actin, Troponin, Tropomyosin)
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| Sarcoplasm | show 🗑
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| Sacroplasmic Reticulum | show 🗑
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| T-Tubules | show 🗑
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| Fenestrated Collar | show 🗑
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| Terminal Cisternae | show 🗑
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| Myoneural Juncture | show 🗑
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| Motor End Plate | show 🗑
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| Mitochondria | show 🗑
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| Lysosomes | show 🗑
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| Golgi Complex | show 🗑
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| show | The basic contractile unit of a muscle
Spans the distance from z-disc to z=disc
Contains 1 A-Band and 2 half I-Bands
Comprised of thick and thin filaments
Avg. resting sarcomere length is 2.5 micrometers
Avg. fiber diameter is 10-100 micrometers
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| show | Dark band in the center of the sarcomere
Location of myosin
Thick filament
Length does not change during contraction
A: Anisotropic, doubly refractive
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| show | Light band on the ends of a sarcomere
Contains actin
Thin filaments
Length shortens when muscles contract
I: Isotropic, singly refractive
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| H Zone | show 🗑
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| show | Area in the center of the H Zone in which there is no myosin heads
Width does not change during muscle contraction
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| Z Disc or Z Line | show 🗑
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| Z Disc or Z Line continued | show 🗑
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| show | Line that divides the sarcomere into two symmetrical halves
The midline of the sarcomere
Composed of M Proteins
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| Myofibrillar Proteins Contractile | show 🗑
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| show | Titan, Nebulin, M Protein, C Protein, Desmin, Alpha-Actinin, Beta-Actinin
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| show | Tropomyosin, Troponin (T, I, C)
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| Actin Located: I-band | show 🗑
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| Myosin Located: A-band | show 🗑
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| show | 3 types: Troponin, Inhibitory, Calcium
Covers the binding site on the actin for myosin heads and binds to the calcium during contraction
Located every 7-8 G-F actin
5% of myofibrillar proteins
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| show | Spans 7 G-actin on the F-actin and is bound to troponin
Located along F-actin
5% of myofibrillar
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| Alpha Actinin Located: Z disc | show 🗑
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| Beta Actinin Located: I band | show 🗑
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| Titan Located: Thick Filament | show 🗑
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| show | Anchors the thin filament to the Z-disc
Located on the entire length of the thin filament
4% of myofibrillar
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| C Protein Located: Thick Filament | show 🗑
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| show | Component of the M-line
Stabilizes rod portion of myosin on the thick filament
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| Desmin Located: I band | show 🗑
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Created by:
CatHern
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