Selasa, 10 Juni 2014


The Muscular System




Muscle System Functions
 
       Provides voluntary movement of body
      Enables breathing, blinking, and smiling
      Allows you to hop, skip, jump, or do push-ups
       Maintains posture
       Produces heat
       Causes heart beat
       Directs circulation of blood
      Regulates
 blood
pressure
      Sends blood to different areas of the body
       Provides movement of internal organs
      Moves food through digestive tract
      Enables bladder control
       Causes involuntary actions
      Reflex actions
      Adjusts opening of pupils
      Causes hair to stand.






Muscle Tissue Characteristics
      Is made up of contractile fibers
      Provides movement
      Controlled by the nervous system
     Voluntary- consciously controlled
     Involuntary- not under conscious control
      Examples:
     Skeletal, Smooth, Cardiac
  
























Comparison of Muscle Types



Muscle Tissue Anatomy








Production of Energy for Muscle
      ATP (adenosine triphosphate)
     A type of chemical energy
     Needed for sustained or repeated muscle contractions
      Muscle cells must have three ways to store or make ATP
     Creatine phosphate
      Rapid production of energy
     Aerobic respiration 
      Uses body’s store of glucose
     Lactic acid production
                               Small amounts of ATP
 
Mechanics of a Muscle Contraction
      When each sarcomere becomes shorter it causes each myofibril to become shorter.
      When each myofibril becomes shorter it causes the muscle fibers to become shorter
            When each muscle fiber shortens the overall muscle contracts.