The Muscular System-Ch 8.9- 8.10. Producing Movement -Skeletal muscles pull on tendons which pulls on bone -By contracting the muscle pulls one bone toward.

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Presentation transcript:

The Muscular System-Ch

Producing Movement -Skeletal muscles pull on tendons which pulls on bone -By contracting the muscle pulls one bone toward another -Origin: the stationary bone that remains in its original position -Insertion: the moveable bone ORIGINS from scapula BELLY of biceps brachii muscle INSERTION on radius ORIGINS from scapula and humerus INSERTION on ulna Tendons Tendon BELLY of triceps brachii muscle

Group Actions -Muscles act in groups to produce movements -Opposing pairs -Flexors/Extensors -Abductors/Adductors -Agonist: muscle causing desired action -Antagonist: muscle that is relaxed Agonist Antagonist

Aging of Muscular Tissue -Skeletal muscle becomes fibrous and adipose tissue -Mainly due to decreased physical activity -Number of SO Fibers increase -Aerobic and strength training activities can reverse effects