Organisms and Energy — Test

Question 20 • Biology

After Frida stops exercising, she continues to breathe heavily. What is most likely occurring in her body?

Answer

Strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.

Heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. Lactate is being transported to her liver. This is a result of aerobic respiration.

Strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.

Heavy breathing during exercise has produced an oxygen surplus in her muscles. This oxygen is being transported to her lungs. This is a result of aerobic respiration.

Explanation

During strenuous exercise, muscles may not receive enough oxygen to meet their energy needs, so they use anaerobic respiration and produce lactate. After exercise, Frida continues breathing heavily to repay the oxygen debt and help process the lactate, which is transported to the liver. Thus, the choice describing oxygen debt after anaerobic respiration is correct; carbon dioxide debt is not the reason.

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