Muscle contractions 

• ATP and Muscle Contraction

  • ATP is produced from ADP and Pi in aerobic respiration
  • ATP is used to provide energy for muscle contraction.
  • When ATP is broken down to ADP and Pi energy is released that is used to power the concentration

• Slow twitch muscle fibers

  • Contraction is slow and less powerful contractions can be made for long periods
  • fibers adapted for aerobic Respiration
  • many mitochondria
  • Store of glycogen. (store of glucose)
  • Contains Large amounts of Myoglobin (protein that Stores Oxygen)
  • large blood supply with many Capillaries.

  

• Fast twitch muscles : TYPE 1

  • 2 types
  • fast twitch Oxidative fibers Similar Many Mitochondria
  • A lot of myoglobin Many blood Capillaries
  • Hydrolose ATP rapidly and Contract
  • Relatively Resistant and fatigue.

• Fast twitch muscles : TYPE 2

  • Glycolytic fast twitch that fatigue quickly
  • Fibers show following adaptations to their role
  • Thicker myosin filaments
  • fewer Capillaries
  • Stove of glycogen for anaerobic respiration

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