PEX 10 01 Week 1

Topics: Carbon dioxide, PH, Bicarbonate Pages: 5 (494 words) Published: July 19, 2015
Name: Shawn Talley
Exercise 10: Acid-Base Balance: Activity 1: Hyperventilation Lab Report Pre-lab Quiz Results
You scored 75% by answering 3 out of 4 questions correctly.
1. The fastest compensatory mechanism for maintaining pH homeostasis in the human body is Your answer : b. the respiratory system.
Correct answer: 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.


page 1

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:

Hyperventilation / Normal

Min PCO2

Max PCO2


page 2

Min pH

Max pH


page 3

Post-lab Quiz Results
You scored 75% by answering 3 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
Your answer: a. excreting H+ and excreting bicarbonate ion.
Correct answer: 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 range for pH is between 7.35 and 7.45, and the normal range for Pco2 is between 35 and 45 mm Hg. 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:
My prediction matched the results,the pH increased to 7.53 from 7.39 and the Pco2 decreased to 30.62 from 40. 3. Explain how returning to normal breathing after hyperventilation differed from hyperventilation without returning to normal breathing.

Your answer:
During Hyperventilation, without returning to normal breathing, Pco2 and pH levels stayed the same at a decreased rate, while Hyperventilation returning to normal, the Pco2 and pH levels tried to level back to a normal rate, after breathing was paused for 10 seconds.

4. Describe some possible causes of respiratory alkalosis.
Your answer:
Possible causes of respiratory alkalosis are high altitudes, fever, panic attack, or anxiety.


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