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Muscular System

Muscular System. Section 9.3 Energy Sources for Muscle Contraction. Creatine Phosphate. 4-6x more CP in muscles than ATP Storage form of PO 4 Made when excess ATP is available. There is enough ATP and CP for 10 seconds of contraction

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Muscular System

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  1. Muscular System Section 9.3 Energy Sources for Muscle Contraction

  2. Creatine Phosphate • 4-6x more CP in muscles than ATP • Storage form of PO4 • Made when excess ATP is available

  3. There is enough ATP and CP for 10 seconds of contraction • After that is gone, use cellular respiration of glucose to make more ATP With lots of ATP: Creatine Creatine Phosphate ADP ATP Without ATP: Creatine Phosphate ADP Creatine ATP

  4. Aerobic respiration needs O2. Myoglobin is the temporary storage of O2. Liver will change lactic acid into glucose(or glycogen), but that needs ATP and all the ATP is being used in the muscles. So lactic acid builds up.

  5. Lactic Acid • Builds up during anaerobic respiration (glycloysis) • Excess lactic acid lowers pH and decreases response of proteins = fatigue • Decrease in electrolyte concentration = uncontrolled nervous stimulation = cramping

  6. Athletes: • Training builds up glycolysis enzymes • With more efficient glycolysis and more O2 because of better capillary beds • More mitochondria for ATP production

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