The Muscular System

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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
• - Encircle openings to digestive and urinary
  tracts sphincters
• - Regulate blood flow, movement of food, enzyme,
  propel urine.
• Maintain body temperature
• Energy from contraction is converted to heat

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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 exerting
  force on tendons, which pull bones.
• When muscle contracts it shortens and pulls two
  jointed bones together.
• However the two bones do not move equally in
  response to the force, one is held in place by
  other muscles which brace it so that the other
  bone will move towards it.

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• Muscles which cause the movement of a joint are
  connected to two different bones muscle
  contraction pulls them together.
• An example would be the contraction of the biceps
  and a relaxation of the triceps. This produces a
  bend at the elbow, an action called flexion
• The 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 under stimulation from
  the CNS
• Voluntary control
• Axons connect to individual muscle fibers

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Anterior View
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Posterior View
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The muscular system

• BBC MUSCLE GAME