HOMEOSTASIS and the MUSCULAR SYSTEM

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HOMEOSTASIS and the MUSCULAR SYSTEM
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MUSCULAR SYSTEMpp 917-922

• skeletal muscles that move bones (voluntary)
• smooth involuntary muscles that protect organs
• cardiac involuntary muscles found only in heart

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MUSCLE CONTRACTION
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• The proteins actin and myosin ? myofibril
• myofibril attaches to Z line
• sarcomere functional unit from Z line to Z line
• contraction shortening of sarcomere between Z
  lines
• myosin heads walk along the actin and requires
  ATP

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REFLEXES

• Quick responses required by your body are
  processed in the gray matter of the spinal cord

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HOMEOSTASIS

• Homeostasis maintaining stable internal
  environment, bringing body back to normal
• The sympathetic and parasympathetic divisions of
  the autonomic system function in opposition to
  each other for flight or fight response