# Exercise 10: Acid/Base Balance Worksheet

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• Published : November 7, 2010

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Exercise 10: Acid/Base Balance Worksheet
Assignment Due: Week 2

Student instructions: Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus.

Respiratory Acidosis and Alkalosis
Activity 1: Normal Breathing

1.At 20 seconds, pH = 7.38
At 40 seconds, pH = 7.38
At 60 seconds, pH = 7.38

2.Did the pH level of the blood change at all during normal breathing? If so, how? No, it remained constant at 7.38

3.Was the pH level always within the “normal” range for the human body? Yes, the pH level remained normal within 7.35 and 7.45

4.Did the PCO2 level change during the course of normal breathing? If so, how? No, it remained constant at 40

Activity 2a: Hyperventilation – Run 1

1.At 20 seconds, pH = 7.41
At 40 seconds, pH = 7.52
At 60 seconds, pH = 7.67

2.Maximum pH = 7.68

3.Did the pH level of the blood change at all during this run? If so, how? Yes, it increased and decreased in order to maintain balance.

4.Was the pH level always within the “normal” range for the human body? If not, when was the pH value outside of the normal range, and what acid/base imbalance did this pH value indicate? The pH balance was not always within the normal range it became higher, therefore it was considered to be in a state of respiratory alkalosis.

5.Did the PCO2 level change during the curse of this run? If so, how? Yes, it changed from 40 to 19.7.

6.If you observed an acid/base imbalance during this run, how would you expect to renal system to compensate for this condition? The renal system would compensate by controlling the output of acids, basis or carbon dioxide from the body within urine.

7.How did the hyperventilation trace differ from the trace for the normal breathing? Did the tidal volumes change? The tidal volume fluctuated between 1 and 4 during hyperventilation and stayed constant around 3 when the normal trace was recorded.

8.What might cause a person to hyperventilate?
Anxiety resulting in heavy breathing could lead to low levels of carbon dioxide in the blood causing hyperventilation.

Activity 2b: Hyperventilation – Run 2

1.What happened to the trace after the 20-second mark when you stopped the hyperventilation? Did the breathing return to normal immediately? Explain your observation. The pH levels began to balance to the normal levels again. It took approximately 3-6 seconds for the body to respond to the change in breathing and then the pH levels returned to normal range.

Activity 3: Rebreathing

1.At 20 seconds, pH = 7.33
At 40 seconds, pH = 7.28
At 60 seconds, pH = 7.25

2.Did the pH level of the blood change at all during this run? If so, how? It increased slightly

3.Was the pH level always within the “normal” range for the human body? If not, when was the pH value outside of the normal range, and what acid/base imbalance did this pH value indicate? Yes, it remained in the normal range at 7.41.

4.Did the PCO2 level change during the course of this run? If so, how? Yes, the carbon dioxide level fluctuated between 40 and 53.02.

5.If you observed an acid/base imbalance during this run, how would you expect the renal system to compensate for this condition? The renal system would compensate by controlling the output of acids, basis or carbon dioxide from the body within urine.

6.How did the rebreathing trace differ from the trace for normal breathing? Did the tidal volumes change? The tidal volumes only changed slightly. They both remained constant between normal levels.

7.Give examples of respiratory problems that would result in pH and PCO2 patterns similar to what you observed during rebreathing? Hyperventilation during exercise or anxiety, breathing into a paper bag would help bring levels back to...