Muscle fatigue is caused by:
Correct answer: B. Accumulation lactic acid
- A. CO2
- B. Accumulation lactic acid
- C. Fumaric acid
- D. Ethyl alcohol
Explanation
Muscle fatigue is caused by the accumulation of lactic acid. Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement, and insufficient supply of O2. During intense exercise sustained to fatigue muscle pH decreases to about 6.4-6.6.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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