[PhysioEX Chapter 10 exercise 2] PEX-10-02

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Exercise 10: Acid-Base Balance: Activity 2: Rebreathing Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. In cases of acidosis, the pH of the blood is
   You correctly answered: c. less than 7.35.

2. Carbon dioxide and water form
   You correctly answered: a. carbonic acid (a weak acid).

3. Which of the following is true of respiratory acidosis?
   You correctly answered: c. The amount of carbon dioxide in the blood is greater than normal.

4. Rebreathing
   You correctly answered: b. is exemplified by breathing into a paper bag.

Experiment Results
Predict Question:
Predict Question: What do you think will happen to the pH and PCO2 levels during rebreathing?
Your answer : b. pH will decrease and PCO2 will increase.

Stop & Think Questions:
Which of the following can cause respiratory acidosis?
You correctly answered: c. airway obstruction

Experiment Data:
Condition Min PCO2 Max PCO2 Min pH Max pH
Normal 40 40 7.39 7.39
Rebreathing 40 54.88 7.22 7.42

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. Rebreathing simulates
   You correctly answered: a. hypoventilation and respiratory acidosis.

2. Hypoventilation results in
   You correctly answered: c. an accumulation of carbon dioxide in the blood.

3. The renal system can compensate for respiratory acidosis by
   You correctly answered: b. excreting H+ and retaining bicarbonate ion.

4. Respiratory acidosis can be caused by all of the following except
   You correctly answered: d. an anxiety attack.

Review Sheet Results

1. Describe what happened to the pH and the carbon dioxide levels during rebreathing. How well did the results compare
   with your prediction?
   Your answer:
   pH decreased and P co2 increased as predicted.

2. Describe some possible causes of respiratory acidosis.
   Your answer:
   Lung diseases, obstructed airway.

3. Explain how the renal system would compensate for respiratory acidosis.
   Your answer:
   Renal system will excrete hydrogen ion to increase pH.