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Read the following scenario to answer the following question(s) . An abundant and continual supply of ATP is necessary for all living cells. Active muscle cells require an extraordinary amount of ATP to permit strenuous exercise for prolonged periods. Toxins, reduced blood flow, and a compromised respiratory system can interfere with the transport of oxygen to active cells. A runner in a marathon faces multiple obstacles to continue to produce sufficient ATP to remain competitive. -Breathing faster when we exercise is necessary to expel ______.


A) carbon dioxide and bring in more oxygen to support aerobic metabolism
B) oxygen and bring in more carbon dioxide to support aerobic metabolism
C) carbon dioxide and bring in more oxygen to support anaerobic metabolism
D) oxygen and bring in more carbon dioxide to support anaerobic metabolism

E) A) and C)
F) A) and B)

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Read the following scenario to answer the following question(s) . An abundant and continual supply of ATP is necessary for all living cells. Active muscle cells require an extraordinary amount of ATP to permit strenuous exercise for prolonged periods. Toxins, reduced blood flow, and a compromised respiratory system can interfere with the transport of oxygen to active cells. A runner in a marathon faces multiple obstacles to continue to produce sufficient ATP to remain competitive. -When oxygen delivery becomes insufficient to support a runner's aerobic metabolism,cells switch to an emergency mode in which ______.


A) ATP is generated less efficiently by harvesting the heat energy in a cell
B) ATP is inefficiently produced and lactic acid is generated as a by-product
C) lactic acid is broken down to produce smaller amounts of ATP
D) carbon dioxide is joined with water to generate much smaller amounts of ATP

E) A) and B)
F) C) and D)

Correct Answer

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The final electron acceptor of aerobic respiration is ______.


A) ATP
B) oxygen
C) lactic acid
D) NAD+

E) All of the above
F) B) and C)

Correct Answer

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