P.E Chapter 3 Acute Responses Muscular System

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jt.mcrae
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97629
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P.E Chapter 3 Acute Responses Muscular System
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2011-08-19 22:26:08
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Chapter Acute Responses Muscular System
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P.E Chapter 3 Acute Responses Muscular System
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  1. What are acute respinses of the muscular system?
    • Increased motor unit and muscle fibre recruitment
    • Increased blood flow to the muscles
    • Increased muscle temperature
    • Increased enzyme activity
    • Incrased o2 supply and use
    • Depleted muscle energy stores
  2. Explain increased motor unit and muscle fibre recruitment
    • More contraction= more motor units and more muscle fibres
    • Greater cintraction force= more motor units and more muscle fibres
  3. Explain increased blood flow to muscles
    • Extra demand of o2 in the muscles
    • Vasodilation then redirects blood flow to working muscles
  4. Explain increased muscle temp
    Heat is a by product of ATP production for energy during exercise
  5. Explain increase enzyme activity
    • Levels of enzymes are increased to account for the amounts of ATP needed by the muscles
    • Enzymes are involved in all chemical processes that produce energy
  6. Explain increased o2 supply and use
    • Muscle cells extract more oxygen from blood flow to replinish ATP stores and remove waste products
    • Causes an increase in a-VO2
  7. Explain depleted muscle energy stores
    • All major muscle energy sources are depleted during exercise for ATP resynthesis by the muslces
    • ATP, PC, glycogen, triglycerides

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