During exercise, the oxygen concentration in the blood increases to twice that of resting levels. Please select the best answer from the choices provided.
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False. During physical exercise the oxygen concentration in the blood remains the same, with regard to rest.

Explanation:

In a healthy person, the concentration of oxygen —also called O₂ saturation— in arterial blood is in the order of 97 and 100%, both at rest and during exercise.

The concentration of oxygen in blood is a parameter that depends on proper respiratory function, and varies according to whether the blood is arterial or venous, where this percentage is lower.

The O₂ saturation in arterial blood allows to know the amount of oxygen that reaches the tissues and it is not a parameter that is modified with the exercise, although the respiratory and cardiac frequencies increase.