Exercise affects cellular respiration by forcing it to produce more ATP meaning that the breathing rate and heart rate increases to inhale oxygen which is constantly needed for ATP to be produced which leads to the increasement of carbon dioxide being exhaled. Cellular respiration has 3 stages (glycolysis, the citric acid cycle and the electron transport chain) glycolysis occurs in the cytoplasm, the citric acid cycle occurs in the mitochondrial matrix, and the electron transport chain occurs in the inner membrane of the mitochondria which requires oxygen. During class we were able to experiment how carbon dioxide, heart rate, and breathing rate get affected with exercise an exerciser was able to help us gather the evidence shown above. We wouldn’t have been able to notice the increasing of carbon dioxide being exhaled after minutes of exercise if it weren’t for Bromothymol blue solution. Bromothymol blue solution is an pH indicator which helps indicate the presence of carbon dioxide. If carbon dioxide were to be present the Bromothymol blue solution were to turn yellowish which indicates the weakness on the acid. During our experiment we were able to notice how while the exercised was in resting time the Bromothymol blue solution took 1 minute and 35 seconds, after the 1 minute it took 60 seconds, and after the 2 minutes it took 33 seconds. As can be seen the amount of carbon dioxide increased after the exerciser was done with the 1 minute exercise and the 2 minute exercise. The amount of carbon dioxide that is present in our exhaled breath increased because of the increasing rate of glycolysis were glucose is broken down in the cytoplasm. This data shows how carbon dioxide increased each minute of exercise this happens because carbon dioxide is traveling through the red blood cells to be exhaled from the body. This would also mean that the heart rate would have to increase because of aerobic respiration if oxygen is being inhaled the heart has to pulse fast to bring to the ETC for water to be made and has to pulse to exhale the (waste product) carbon dioxide.The heart rate of the exerciser also increased as can be seen in figure 2. During the resting time the person’s heart rate was 60 pulses, after a minute of exercise it was 119 pulses , and after two minutes of exercise it was 127 pulses. What this data shows is that the pulses increased the increasing was because the heart is pulsing blood to all of our body while we are exercising and trying to get fit. The heart rate also increases because it pulses blood that way it could bring energy and oxygen to our muscles while we are exercising. The pulses also increase because our blood cells have to bring carbon dioxide to our lungs for it to be exhaled since energy is constantly being made by cellular respiration which is aerobic. So far both carbon dioxide and the heart rate have been increasing and it didn’t change for the exercisers breathing rate it also increased.As can be seen in figure 3 the exercisers breathing rate increased because of the need of oxygen. While the exerciser was on rest their breathing rate was at 20, after 1 minute of exercise it was at 27, and after 2 minutes of exercise the rate increased to 34. Figure 3 illustrates that the breathing rate increased this is because cellular respiration needs more oxygen to provide the bodies muscles ATP. When an athlete person exercise their breathing rate and lactic acid rise even more less than a person who is unfit or doesn’t do exercise. A lactic acid is a fermentation that is carried out by bacteria from yogurt and by the muscle cells when they are worked fast and really hard. While you are doing exercise there is a moment that you take a while for your breath to come back to normal this kind of break is called a recovery time if the person is fit then the recovery time is shorter. Overall, exercise affects cellular respiration by increasing the heart rate, breathing rate, and carbon dioxide which is constantly being exhaled because ATP is constantly made.