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Physioex 8.0 Exercise 10

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Respiratory Acidosis and Alkalosis
Activity 1: Normal Breathing

1. At 20 seconds, pH = 7.4 2. At 40 seconds, pH = 7.4 3. At 60 seconds, pH = 7.4 4. Did the pH level of the blood change at all during normal breathing? If so, how? No, it stayed at 7.4 5. Was the pH level always within the “normal” range for the human body? Yes 6. Did the PCO2 level change during the course of normal breathing? If so, how? No, it stayed at 40mm Hg

Activity 2a: Hyperventilation – Run 1

1. At 20 seconds, pH = 7.43 2. At 40 seconds, pH = 7.52 3. At 60 seconds, pH = 7.67 4. Maximum pH = 7.68 5. Did the pH level of the blood change at all during this run? If so, how? Yes pH levels in the blood did change, …show more content…

Hyperventilation was closest, with the Pco2 lowered 5. Explain why this type of breathing resulted in alkalosis. Hyperventilation causes alkalosis because it lowers Pco2 to below-normal levels. When carbon dioxide levels are reduced, this reduces the amount of H+ in the blood, increasing the blood’s pH level.

Activity 6: Renal Response to Respiratory Acidosis

1. What level of [H+] was present in the urine at each of these PCO2/pH levels? Pco2 pH H+ 60 7.29 elevated 75 7.2 elevated 90 7.11 elevated 2. What level of [HCO3-] was present in the urine at each of these PCO2/pH levels? Pco2 pH HCO3- 60 7.29 decreased 75 7.2 decreased 90 7.11 decreased 3. Assuming that enough time has passed for the renal system to fully compensate for respiratory acidosis, would you expect PCO2 levels to increase or decrease? Would you expect blood pH levels to increase or decrease? The pH levels would increase returning to normal range and the Pco2 levels would decrease back to normal (40 mmHg) 4. Which type of breathing resulted in PCO2 levels closest to the ones we experimented with in this activity – normal breathing, hyperventilation, or rebreathing? Rebreathing was closest, with the Pco2 raised and the pH decreased 5. Explain why this type of breathing resulted in acidosis. Rebreathing causes acidosis because it

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