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Muscle Energy Pathways
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There are 3 different pathways:
Direct phosphorylation Aerobic respiration Anaerobic glycolysis and lactic acid formation
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ATP & Muscle Contraction
Muscles use ATP (adenosine triphosphate) to contract. Muscles store only about 4-6 seconds worth of ATP.
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ATP & Muscle Contraction
Partner Lateral: 1. What is ATP used for in the muscles? Specifically, what is going on with the myofilaments? Partner Medial: 2. In terms of time, how much ATP do we have stored in our muscles?
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Pathway 1: Direct Phosphorylation of ADP by Creatine Phosphate
Creatine Phosphate (CP) is found within muscle fibers. CP transfers its phosphate group to ADP (adenosine diphosphate) to create ATP for muscle contraction Enough CP is in your muscles for about 20 – 30 seconds of activity.
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Partner Talk Explain the process by which Creatine Phosphate makes ATP… _____ + ______ = ATP In terms of time, how much Creatine Phosphate do we have stored in our muscles?
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2. Aerobic Respiration Requires a constant supply of oxygen and nutrients. Converts Glucose and Oxygen into ATP, Water and Carbon Dioxide. Produces ATP very slowly; Produces the most ATP (36 ATP) of all the Pathways.
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Aerobic Respiration Partner Coffee:
What two things does Aerobic Respiration require in order to work? Partner Tea: How many ATP does Aerobic Respiration produce and is it a fast or slow process?
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3. Anaerobic Glycolysis Occurs when oxygen is not present
Glucose is converted to Lactic Acid and ATP Makes ATP 2 ½ times faster than Aerobic Respiration, however, only produces 2 ATP per Glucose molecule Provides ATP for 30 – 60 seconds of activity
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Anaerobic Glycolysis How does Anaerobic Glycolysis compare to Aerobic Respiration in the following ways: Requirement of Oxygen Amount of ATP Produced Speed of Producing ATP What else is produced by Anaerobic Glycolysis besides ATP?
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Muscle Fatigue & Oxygen Debt
Muscle Fatigue – Muscle is unable to contract even though it is stimulated. Oxygen Debt – Inability to take in oxygen fast enough to keep muscles supplied with oxygen Recovery Period – Period of time after activity when oxygen, ATP, and CP levels are restored. Indicated by heavy & rapid breathing.
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Muscle Fatigue & Oxygen Debt
Do a rock, paper, scissor with your partner. Partner Winner: Explain Muscle Fatigue Partner Loser: Explain Oxygen Debt and Recovery Period
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Muscle Fatigue & Lactic Acid
Muscle Fatigue is the result of a lack of Oxygen and the production of Lactic Acid Lactic Acid build up, causes a decrease in ATP Production. Recovery Period ‘pays back’ the Oxygen Debt.
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Muscle Fatigue & Lactic Acid
Complete the following sentence: Muscle Fatigue is caused by a lack of ______ and a production of ________ Which muscle energy pathway is being used that causes muscle fatigue? Explain your answer.
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Answer these questions on page 16 of your notebook.
Which muscle energy pathway requires a constant supply of oxygen to produce ATP? Which muscle energy pathway produces Lactic Acid as a byproduct? Which muscle energy pathway provides ATP to the muscle for the first seconds of activity? What is the name of the time following activity in which the oxygen, ATP and CP levels are restored in the body? Make a pledge to your muscles to improve their overall health/function. I _____, will…. Because…
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