Oxygen debt in muscles may develop because of
A)the inability of respiratory and circulatory systems to supply enough oxygen to skeletal muscles when used strenuously for a minute or two.
B)the inability of myoglobin molecules to store enough oxygen when skeletal muscles are used strenuously for a minute or two.
C)too much oxygen used in forming pyruvic acid when skeletal muscles are contracted strenuously for a minute or two.
D)too high a concentration of oxygen in the atmosphere.

Question

Quizplus · Accepted Answer

Oxygen debt occurs when there is a lack of oxygen supplied to the muscles during strenuous activity, leading to the production of lactic acid. This can happen when the respiratory and circulatory systems can't keep up with the oxygen demands of the working muscles. Myoglobin helps store oxygen in muscles, but it is not the primary factor in the development of oxygen debt. The concentration of oxygen in the atmosphere is typically not a limiting factor in oxygen delivery to the muscles. The formation of pyruvic acid during muscle activity is a normal process and is not directly related to the development of oxygen debt.

Oxygen Debt in Muscles May Develop Because of