<prompt> What will occur with increase in alveolar ventilation rate ?Decreased paial pressure of O2 in alveoliDecreased paial pressure of CO2 in alveoliDecreased CO2 diffusion from blood to alveoliDecreased O2 diffusion from alveoli to blood  <response>: Ans. is b i.e., Decreased paial pressure of CO2 in alveoliAlveolar ventilation is the amount of inspired air entering in gas-exchange areas alveoli per minute during quite breathing. It excludes the air which remains in dead space. 