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Muscle Fatigue and Performance Quiz

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Questions and Answers

Which of the following is the primary cause of muscle fatigue?

Interference with cross-bridge cycle

Alteration in glycolytic enzymes

Build-up of lactic acid (correct)

Decrease in glycogen stores

What effect does increased acidity have on glycolytic enzymes?

No effect on their activity

Decreases their activity (correct)

Causes them to malfunction

Increases their activity

What happens to muscle performance as a result of fatigue?

It remains unchanged

It decreases (correct)

It improves

It becomes more efficient

What happens to glycogen stores during exercise?

They deplete Signup and view all the answers

How does the rate of energy production from fat compare to that from glucose?

It is lower Signup and view all the answers

Which of the following contributes to the temporary excess oxygen use after exercise?

Increased temperature in heart and skeletal muscle Signup and view all the answers

What needs to happen for the oxygen debt to be resolved?

Metabolism of lactic acid into CO2 and H2O Signup and view all the answers

What is the primary cause of oxygen debt?

Conversion of lactic acid to glucose Signup and view all the answers

Study Notes

Muscle Fatigue

Primary cause of muscle fatigue: accumulation of lactic acid and inorganic phosphates
Increased acidity: inhibits glycolytic enzymes, reducing energy production

Exercise and Energy Production

During exercise: glycogen stores are depleted
Rate of energy production from fat: slower compared to glucose
Energy from fat: primary source during low-intensity, long-duration activities

Oxygen Debt

Temporary excess oxygen use after exercise: contributes to excess post-exercise oxygen consumption (EPOC)
Resolution of oxygen debt: repayment of oxygen deficit through increased oxygen intake
Primary cause of oxygen debt: imbalance between oxygen demand and supply during exercise

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Description

Test your knowledge on muscle fatigue and its effects on muscle performance with this quiz. Learn about the causes of fatigue, including the build-up of lactic acid, and how it impacts glycolytic enzymes and the actin: myosin cycle. Explore the various factors contributing to a decrease in muscle performance.