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112 Cards in this Set
- Front
- Back
Epimysium |
A dense layer of collagen fibers, surrounds the entire muscle. |
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Skeletal Muscle |
A complex organ containing skeletal muscle fibers |
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Perimysium |
A fibrous layer that divides the skeletal muscle into a a series of compartments |
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Muscle Fascicle |
A bundle of muscle fibers |
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Endomysium |
A thin layer of areolar connective tissue that surrounds each muscle fiber |
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Endomysium |
A thin layer of areolar connective tissue that surrounds each muscle fiber |
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Myosatellite Cells |
Stem cells that function in the repair of damaged muscle tissue |
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Muscle Fibers |
Sheathed in a delicate endomysium that contains capillaries, myosatellite cells, and the axons of the neurons that control the muscle fibers |
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Muscle Fibers |
Sheathed in a delicate endomysium that contains capillaries, myosatellite cells, and the axons of the neurons that control the muscle fibers |
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Myoblasts |
Groups of embryonic cells |
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Sarcolemma |
Plasma Membrane |
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Sarcoplasm |
Cytoplasm |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Thin filaments |
Most abundant Composed primarily of actin |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Thin filaments |
Most abundant Composed primarily of actin |
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Thick Filaments |
Composed primarily of myosin |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Thin filaments |
Most abundant Composed primarily of actin |
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Thick Filaments |
Composed primarily of myosin |
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Sacromeres |
• Repeating contractile units • Each Myofibril consists of around 10,000 •Aligned end to end • has a resting length of about 2 um |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Thin filaments |
Most abundant Composed primarily of actin |
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Thick Filaments |
Composed primarily of myosin |
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Sacromeres |
• Repeating contractile units • Each Myofibril consists of around 10,000 •Aligned end to end • has a resting length of about 2 um |
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H Band |
The lighter region on either side of the M line |
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Myofibril |
Cylindrical structure 1-2 um in diameter and as long as the entire fiber |
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Striations |
Light and dark bands |
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Myofilaments |
Bundles of protein filaments |
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Thin filaments |
Most abundant Composed primarily of actin |
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Thick Filaments |
Composed primarily of myosin |
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Sacromeres |
• Repeating contractile units • Each Myofibril consists of around 10,000 •Aligned end to end • has a resting length of about 2 um |
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H Band |
•The lighter region on either side of the M line •Contains thick filaments but no thin ones |
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M Line |
Connects the central portion of each of each thick filament |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Actinins |
Interconnect thin filaments of adjacent sarcomeres |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Actinins |
Interconnect thin filaments of adjacent sarcomeres |
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Zone of Overlap |
Thin filaments are arranged in a 6:1 ratio around each thick filament |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Actinins |
Interconnect thin filaments of adjacent sarcomeres |
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Zone of Overlap |
Thin filaments are arranged in a 6:1 ratio around each thick filament |
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A Band |
The dense region of the sarcomere that contains thick filaments |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Actinins |
Interconnect thin filaments of adjacent sarcomeres |
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Zone of Overlap |
Thin filaments are arranged in a 6:1 ratio around each thick filament |
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A Band |
The dense region of the sarcomere that contains thick filaments |
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I Band |
• contains thin filaments and no thick ones • extends from A band of one sarcomere to the A band of the next |
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Z Line |
•Marks the boundary between adjacent sarcomeres. •consists of actinins |
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Actinins |
Interconnect thin filaments of adjacent sarcomeres |
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Zone of Overlap |
Thin filaments are arranged in a 6:1 ratio around each thick filament |
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A Band |
The dense region of the sarcomere that contains thick filaments |
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I Band |
• contains thin filaments and no thick ones • extends from A band of one sarcomere to the A band of the next |
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Transverse Tubules |
Narrow tubes that are continuous with the Sarcolemma and extend into the sarcoplasm at right angles into the cell surface |
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Sarcoplasmic Reticulum |
Forms a tubular network around each individual myofibril |
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Terminal Cisternae |
On either side of a T Tubule, the tubules of the SR enlarge, fuse and form expanded chambers |
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Terminal Cisternae |
On either side of a T Tubule, the tubules of the SR enlarge, fuse and form expanded chambers |
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Triad |
The combination of a pair of terminal cisternae plus a transverse tubule |
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Terminal Cisternae |
On either side of a T Tubule, the tubules of the SR enlarge, fuse and form expanded chambers |
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Triad |
The combination of a pair of terminal cisternae plus a transverse tubule |
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Calsequestrin |
Protein |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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F-actin |
Is a twisted strand composed of two rows of 300-400 individual molecules of G-actin |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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F-actin |
Is a twisted strand composed of two rows of 300-400 individual molecules of G-actin |
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Nebulin |
•A large protein that extends along the F-actin strand •Holds the F-actin strand together |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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F-actin |
Is a twisted strand composed of two rows of 300-400 individual molecules of G-actin |
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Nebulin |
•A large protein that extends along the F-actin strand •Holds the F-actin strand together |
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G-actin |
Contains an active site to which myosin can bind |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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F-actin |
Is a twisted strand composed of two rows of 300-400 individual molecules of G-actin |
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Nebulin |
•A large protein that extends along the F-actin strand •Holds the F-actin strand together |
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G-actin |
Contains an active site to which myosin can bind |
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Tropomyosin |
Strands cover the active sites on G-actin and prevent actin-myosin interaction |
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Actinins Actions |
Interconnects the thin filaments at the Z line, creating an open mesh work at the end of the sarcomere |
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F-actin |
Is a twisted strand composed of two rows of 300-400 individual molecules of G-actin |
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Nebulin |
•A large protein that extends along the F-actin strand •Holds the F-actin strand together |
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G-actin |
Contains an active site to which myosin can bind |
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Tropomyosin |
Strands cover the active sites on G-actin and prevent actin-myosin interaction |
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Troponin |
Consists of three globular subunits |
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Myosin Molecules |
A thick filament contains about 300 molecules |
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Myosin Molecules |
A thick filament contains about 300 molecules |
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Titin |
The core of each thick filament |
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Myosin Molecules |
A thick filament contains about 300 molecules |
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Titin |
The core of each thick filament |
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Free head |
Two globular protein subunits. During contraction, the myosin heads interact with the thin filaments |
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Myosin Molecules |
A thick filament contains about 300 molecules |
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Titin |
The core of each thick filament |
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Free head |
Two globular protein subunits. During contraction, the myosin heads interact with the thin filaments |
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Sliding Filament Theory |
A skeletal muscle fiber contracts, thin filaments slide past the thick filaments. 1) the H bands and I bands get smaller 2) the zones of overlap get larger 3) the Z lines move closer together 4) the width of the A band remains constant |
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Myosin Molecules |
A thick filament contains about 300 molecules |
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Titin |
The core of each thick filament |
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Free head |
Two globular protein subunits. During contraction, the myosin heads interact with the thin filaments |
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Sliding Filament Theory |
A skeletal muscle fiber contracts, thin filaments slide past the thick filaments. 1) the H bands and I bands get smaller 2) the zones of overlap get larger 3) the Z lines move closer together 4) the width of the A band remains constant |
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Synaptic Cleft |
A narrow space, separate the axon terminal of the neuron from the opposing motor end plate |