PEX-10-01

Name: Group 4 Exercise 10: Acid-Base Balance: Activity 1: Hyperventilation Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. The fastest compensatory mechanism for maintaining pH homeostasis in the human body is You correctly answered: c. the chemical buffering system. 2. An increase in hydrogen ion concentration would You correctly answered: d. decrease pH. 3. The amount of carbon dioxide in the blood is measured in You correctly answered: b. mm Hg. 4. The reaction of water and carbon dioxide is catalyzed by You correctly answered: a. carbonic anhydrase.

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Experiment Results Predict Question: Predict Question: What do you think will happen to the pH and PCO2 levels with hyperventilation? Your answer : c. pH will increase and PCO2 will decrease. Stop & Think Questions: Were the pH and PCO2 in the normal range? You correctly answered: c. Both pH and PCO2 were in the normal range. What was the effect of returning to normal breathing after hyperventilation? You correctly answered: b. The breathing stopped temporarily to retain carbon dioxide. Experiment Data: Condition Normal Hyperventilation Hyperventilation / Normal

Min PCO2 40 19.7 35.3

Max PCO2 40 40 40

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Min pH 7.41 7.4 7.38

Max pH 7.41 7.69 7.46

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Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Hyperventilation results in You correctly answered: b. respiratory alkalosis. 2. With hyperventilation, the higher peaks on the tracing indicate You correctly answered: a. a larger volume of air. 3. Which of the following is not a potential cause of respiratory alkalosis? You correctly answered: d. emphysema 4. The kidneys can compensate for respiratory alkalosis by You correctly answered: b. retaining H+ and excreting bicarbonate ion.

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Review Sheet Results 1. Describe the normal ranges for pH and carbon dioxide in the blood. Your answer: The normal pH value is7.42 while the carbon dioxide is 40. 2. Describe what happened to the pH and the carbon dioxide level with hyperventilation. How well did the results compare with your prediction? Your answer: During hyperventilation, the ph value increases and the Pco2 level decreases. The results show that the prediction made is correct. 3. Explain how returning to normal breathing after hyperventilation differed from hyperventilation without returning to normal breathing. Your answer: In returning the breathing pattern to normal from hyperventilation, there should be about 10 seconds where the breathing is stopped or held so that there will be time to retain CO2. 4. Describe some possible causes of respiratory alkalosis. Your answer: Increasing of respiration, for example by stimulation of respiratory center followed by dieases.

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