Sliding Filament theory

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Last updated 10:07 AM on 7/16/24
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16 Terms

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Muscle

Bundle of muscle fibers.

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Muscle fiber

Consists of myofibrils.

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Myofibrils

Composed of myofilaments (actin + myosin).

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Actin

Thin myofilament.

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Myosin

Thick myofilament.

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Sarcomere

Functional unit of myofibril, separated by Z-lines.

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I band

Distance between myosin strands.

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A band

Length of myosin.

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H zone

Distance between actin strands.

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Z line

End of the sarcomere.

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Sarcoplasmic reticulum

Stores calcium ions.

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Troponin

Binds calcium ions, allowing contraction to begin.

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ATP

Hydrolyzed to energize myosin heads for the power stroke.

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Power stroke

Myosin attaches to actin, pulls filaments, and releases energy.

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Ratchet motion

Movement of myosin head during contraction.

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Contraction cycle

Continues with ATP and calcium availability.