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Published bySteven Collins Modified over 6 years ago
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The Muscular System What do skeletal muscles do? How do muscles work?
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Functions of Muscle Tissue
Produce movement Muscle pulls tendons to move the skeleton Maintain posture and body position - Continuous muscle contraction Support soft tissue -Support weight of visceral organs Movement of substance around the body - Regulate blood flow, movement of food, urine…. Maintain body temperature
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Types of muscles tissue
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Skeletal Muscle Muscles are bundles of cells and fibres.
Muscles work in a very simple way; all they do is contract or relax. Muscles can only pull, they never push. Muscles generally work in pairs to produce movement: when one muscle contracts the other relaxes. There are 630 active muscles in your body
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Muscle Action Skeletal muscles produce movement by putting force on tendons, which pull bones. When muscle contracts it shortens and pulls two jointed bones together.
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The opposite movement:
An example Contraction of the biceps and a relaxation of the triceps. This produces a bend at the elbow The opposite movement: Contraction of the triceps and relaxation of the biceps produces the effect of straightening the arm.
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Muscle contractions require energy
Blood vessels deliver oxygen and nutrients to produce ATP ATP is the cellular energy molecule produce in the mitochondria Muscle contractions are stimulated by the CNS Voluntary control Axons of neurons connect to individual muscle fibers
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Anterior View
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Posterior View
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Injuries to Muscular System
Tendonitis Inflammation of a tendon Usually found in athletes Muscular dystrophy Muscles break down and you become paralyzed
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The muscular system BBC MUSCLE GAME
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