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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