Question:
Given below are two statements.
Statement I - Skeletal muscles usually derive energy by anaerobic respiration.
Statement II - After vigorous exercise lactic acid accumulates in muscle fibres leading to muscle fatigue.
In the light of above statements, choose the most appropriate answer from the options given below:
Given below are two statements.
Statement I - Skeletal muscles usually derive energy by anaerobic respiration.
Statement II - After vigorous exercise lactic acid accumulates in muscle fibres leading to muscle fatigue.
In the light of above statements, choose the most appropriate answer from the options given below:
Statement I - Skeletal muscles usually derive energy by anaerobic respiration.
Statement II - After vigorous exercise lactic acid accumulates in muscle fibres leading to muscle fatigue.
In the light of above statements, choose the most appropriate answer from the options given below:
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Muscle energy rule: Normal = aerobic; Intense exercise = anaerobic → lactic acid → fatigue.
Updated On: May 4, 2026
- Both statement I and statement II are correct.
- Both statement I and statement II are incorrect.
- Statement I is correct but statement II is incorrect.
- Statement I is incorrect but statement II is correct.
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Muscle cells can perform both aerobic and anaerobic respiration depending on oxygen availability.
Step 1: Analyze Statement I. Under normal conditions, skeletal muscles primarily derive energy through aerobic respiration. Anaerobic respiration occurs only during oxygen deficiency (e.g., intense exercise). Thus, Statement I is incorrect.
Step 2: Analyze Statement II. During vigorous exercise:
• Oxygen supply becomes insufficient
• Anaerobic respiration occurs
• Lactic acid accumulates in muscles This accumulation causes muscle fatigue. Thus, Statement II is correct.
Step 3: Conclusion. \[ \text{Statement I is incorrect, Statement II is correct} \]
Muscle cells can perform both aerobic and anaerobic respiration depending on oxygen availability.
Step 1: Analyze Statement I. Under normal conditions, skeletal muscles primarily derive energy through aerobic respiration. Anaerobic respiration occurs only during oxygen deficiency (e.g., intense exercise). Thus, Statement I is incorrect.
Step 2: Analyze Statement II. During vigorous exercise:
• Oxygen supply becomes insufficient
• Anaerobic respiration occurs
• Lactic acid accumulates in muscles This accumulation causes muscle fatigue. Thus, Statement II is correct.
Step 3: Conclusion. \[ \text{Statement I is incorrect, Statement II is correct} \]
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