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Muscular System

The muscular system comprises over 600 muscles, contributing to 45% of body weight, packed with mitochondria and blood vessels. It plays key roles in locomotion, posture, temperature regulation, respiration, and internal movement. Muscles exhibit four main characteristics: excitability, contractibility, extensibility, and elasticity. There are three main types of muscle tissue: skeletal (voluntary, striated), smooth (involuntary, non-striated), and cardiac (involuntary, striated with intercalated disks). Understanding these components is essential for studying human anatomy and physiology.

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Muscular System

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  1. Muscular System

  2. Terminology (pg. 167) myo- fasciculus sarco- platys iso- tonos syn- -trophy tetanos caput

  3. Introduction • Over 600 muscles • Lots of mitochondria and blood vessels • 45% of body weight is muscles

  4. Functions • Locomotion: move skeleton

  5. 2. Posture: some muscles are always partially contracted

  6. 3. Maintain body temperature by producing heat

  7. 4.Respiration and circulation

  8. Guarding entrances and exits (sphincters)

  9. 6.Movement along internal passageways (peristalsis)

  10. 7.Communication (verbal and body language)

  11. 1. Excitability-ability to respond Characteristics

  12. 2.Contractibility-ability to shorten

  13. 3.Extensibility-ability to stretch

  14. 4.Elasticity-ability to return to previous length

  15. Types-Skeletal striated-appear lined voluntary lots of nuclei in the cell

  16. Smooth • Non-striated • Involuntary • Spindle shaped

  17. Cardiac • Striated • Involuntary • Branched intercolated disks

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