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Muscular System (Muscle Fatigue (Medication, Mineral Deficiency, Age,…
Muscular System
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Major Functions
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Stabilize Joints -> when all muscles, tendons, ligaments, bones, and other soft tissues work together to maintain a stable joint
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Muscle Contraction
Actin
a thin, contractile protein filament, containing 'active' or 'binding' sites
Myosin
a thick, contractile protein filament, with protrusions known as Myosin Heads
Sliding Filament
A theory that explains muscle contraction through how filaments such as myosin and actin slide in and out between each other to form a contraction. Calcium binds to troponin, changing its shape and moving Tropomyosin from the active site of actin. Once impulses stop, the calcium is pumped back to sarcoplasmic reticulum and actin returns to its resting potential causing muscle to lengthen and relax. ATP is chemical energy which enables myosin to pull actin filaments inwards, shortening the muscle.
Muscle Function
Origin -> the attachment site that doesn't move during contraction, proximal or closer to the body
Insertion -> the attachment site that does move when the muscle contracts, usually distal
Roles
Agonist -> the principal muscle involved in an action, also called the prime mover, assisted by a synergist
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Antagonist -> a muscle with the opposite action of the prime mover, help maintain body or limb position and control rapid movement
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