Muscular System

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Muscular System
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Terminology (pg. 167)

• myo- fasciculus
• sarco- platys
• iso- tonos
• syn- -trophy
• tetanos caput

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Introduction

• Over 600 muscles
• Lots of mitochondria and blood vessels
• 45 of body weight is muscles

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Functions

• Locomotion move skeleton

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• 2. Posture some muscles are always partially
  contracted

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3. Maintain body temperature by producing heat
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• 4.Respiration and circulation

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• Guarding entrances
• and exits (sphincters)

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• 6.Movement along internal passageways
  (peristalsis)

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• 7.Communication (verbal and body language)

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Characteristics

• 1. Excitability-ability to respond

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• 2.Contractibility-ability to shorten

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• 3.Extensibility-ability to stretch

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• 4.Elasticity-ability to return to previous length

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Types-Skeletal

• striated-appear lined
• voluntary
• lots of nuclei in the cell

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Smooth

• Non-striated
• Involuntary
• Spindle shaped

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Cardiac

• Striated
• Involuntary
• Branched intercolated disks

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