Multiple Choice
Which of the following situations would delay the development of muscle fatigue the longest during cellular respiration?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
Which metabolic waste product accumulates in muscle tissue during excessive exertion?
A
Lactic acid
B
Ammonia (\(\mathrm{NH_3}\))
C
Urea
D
Carbon dioxide (\(\mathrm{CO_2}\))
Verified step by step guidance1
Understand the context: During excessive exertion, muscle cells may experience a lack of oxygen, leading to anaerobic respiration instead of aerobic respiration.
Recall the process of anaerobic respiration: In the absence of sufficient oxygen, glucose is broken down into pyruvate through glycolysis. Pyruvate is then converted into lactic acid to regenerate NAD+, which is needed for glycolysis to continue.
Identify the metabolic waste product: Lactic acid accumulates in muscle tissue as a byproduct of anaerobic respiration during intense physical activity.
Clarify why other options are incorrect: Ammonia (\(\mathrm{NH_3}\)) and urea are nitrogenous waste products primarily associated with protein metabolism and excreted by the kidneys, not muscle activity. Carbon dioxide (\(\mathrm{CO_2}\)) is a byproduct of aerobic respiration, which requires oxygen.
Conclude: The correct answer is lactic acid, as it is specifically produced in muscle tissue during anaerobic respiration under conditions of excessive exertion.
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