The partial pressure of oxygen will decrease, and the rate of diffusion will increase.
The partial pressure decreases during exercise because demand increases for the greater amount of oxygen. This means that the person is not getting a sufficient amount of oxygen during aerobic exercise.
When a person does aerobic exercise, there are more alveoli recruited for gas exchange, therefore the surface area available for gas exchange increases, and thus the rate of diffusion of gases such as oxygen will increase.
When a person exercises, there is a slight increase in the temperature of the body and to regulate the body temperature, more energy is also used. The increased usage of energy leads to an increase in the rate of diffusion of oxygen which will provide the energy to the muscles which are undergoing the exercise.
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