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Muscular System (Major muscles of the back, shoulder and chest (Rhomboids,…
Muscular System
Major muscles of the back, shoulder and chest
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Deltoid
Abduction, extension, lateral rotation, flexion and medial rotation of arm
Trapezius
Elevation, depression and retraction of the scapula
Pectoralis major
Adduction, flexion and medial rotation of arm
Latissimus dorsi
Adduction, extension and medial rotation of the arm. Retraction and depression of shoulder
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3 types of muscle tissues,
Smooth muscle
located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control.
Skeletal muscle
Skeletal muscle fibers occur in muscles which are attached to the skeleton. They are striated in appearance and are under voluntary control.
Cardiac muscle
located in the walls of the heart, appear striated, and are under involuntary control.
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The sliding filament theory is the explanation for how muscles contract to produce force. The actin and myosin filaments within the sarcomeres of muscle fibres bind to create cross-bridges and slide past one another, creating a contraction. The sliding filament theory explains how these cross-bridges are formed and the subsequent contraction of muscle.
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