As a human exercises, cellular respiration increases. an increase in cellular respiration causes an increase in cellular co2 levels. co2 diffuses into the blood, where the majority of it is converted to h2co3. an increase in h2co3 will lead to an increased breathing rate due to

When exercising, most especially if it is strenuous, a person would most likely experience increased breathing rate. It basically happens for the main reason that our heart needs to pump more blood for the body's increasing demands in order to remove carbon dioxide and inhale more oxygen.