During exercise, the cardiovascular system must supply muscles with large amounts of oxygen and fuel and get rid of a lot of wastes. How do the cardiovascular systems of athletes respond to prolonged exercise? When athletes exercise, what is the primary physiological variable responsible for their sustained increase in ventilation rate? a. decreased blood PO2 b. increased blood PCO2 c. increased blood pH d. increased body temperature

Video transcript

Hello everyone here We have a question that says an increased concentration of blank is the strongest stimulus to breathe more deeply and more frequently. The increased concentration of C carbon dioxide is the strongest stimulus to breathe more deeply and more frequently, oxygen is the stimulus for breathing only in hypoxic conditions. So it isn't a nitrogen is an inert gas and it's not a stimulant for breathing. So it's not be and blood glucose stimulates pancreatic insulin or glucose gone relief. So it isn't the, so our answer is C carbon dioxide. Thank you for watching. Bye.