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Providing Energy for Contraction. Aerobic v. Anaerobic Respiration.

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Presentation on theme: "Providing Energy for Contraction. Aerobic v. Anaerobic Respiration."— Presentation transcript:

1 Providing Energy for Contraction

2 Aerobic v. Anaerobic Respiration

3 Lactic Acid Fermentation Without an adequate supply of oxygen, glycolysis is the primary source of ATP production. In order for glycolysis to continue, NADH must be oxidized back to NAD + In our cells, this is accomplished by lactic acid fermentation

4 The Cori Cycle

5 Muscle Fatigue Physiological decline in maximal force or power capability of muscle contraction. – Mechanisms that cause fatigue can vary and are specific to the task being performed: Reduced ATP supply Levels of hydrogen (H + ) and calcium (Ca 2+ ) Different from psychological inability. Complete absence of ATP prevents muscle relaxation – Rigor mortis – Writer’s cramp


7 Lactic Acid – Friend or Foe? A side effect of high lactate (L.A.) levels is an increase in acidity of muscle cells, which slows the process of glycolysis The build up of lactic acid results in a burning sensation, however scientists believe this is a natural defense mechanisms to prevent damage during extreme exertion. Body is forced to slow down, O 2 supplies are restored, lactate reverts to pyruvate and aerobic respiration can proceed.

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