After hyperventilation, the respiratory rate is slower than respiratory rate during normal breathing. Chemoreceptor sense this change and decreased the respiratory rate to reduce the amount of CO2 being exhaled and thus PCO2 in blood increases back up. Click to see full answer. Similarly, how does hyperventilation decrease respiratory rate?
During hyperventilation the rate of removal of carbon dioxide from the blood is increased. As the partial pressure of carbon dioxide in the blood decreases, respiratory alkalosis, characterized by decreased acidity or increased alkalinity of the blood, ensues.