[PhysioEX Chapter 10 exercise 3] PEX-10-03

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Exercise 10: Acid-Base Balance: Activity 3: Renal Responses to Respiratory Acidosis and Respiratory Alkalosis Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. The renal system compensates for
   You correctly answered: d. both respiratory acidosis and respiratory alkalosis.

2. Respiratory alkalosis is characterized by
   You correctly answered: a. pH greater than 7.45 and PCO2 less than 35 mm Hg.

3. Respiratory acidosis is characterized by
   You correctly answered: c. pH less than 7.35 and PCO2 greater than 45 mm Hg.

4. The functional unit of the kidney is the
   You correctly answered: b. nephron.

Experiment Results
Predict Question:

Predict Question 1: What effect do you think lowering the PCO2 will have on [H+ ] and [HCO3- ] in the urine?
Your answer : d. [H+ ] will decrease and [HCO3- ] will increase.

Predict Question 2: What effect do you think raising the PCO2 will have on [H+ ] and [HCO3- ] in the urine?
Your answer : c. [H+ ] will increase and [HCO3- ] will decrease.

Stop & Think Questions:
The condition you just simulated is
You correctly answered: b. respiratory alkalosis caused by hyperventilation.
Can the renal system fully compensate for acidosis or alkalosis?
You correctly answered: d. No, neither for respiratory alkalosis nor respiratory acidosis.

Experiment Data:
PCO2 Blood pH [H+] in Urine [HCO3-] in Urine
40 7.41 normal normal
30 7.58 decreased elevated
60 7.32 elevated decreased

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

1. When adjusting the controls, what happens to the blood pH when you lower the PCO2?
   You correctly answered: a. The pH increases.

2. In uncompensated respiratory alkalosis, the
   You correctly answered: b. carbon dioxide levels of the blood are low.

3. What type of breathing results in acidosis?
   You correctly answered: d. hypoventilation and rebreathing

4. With renal compensation for respiratory acidosis, the pH of the urine
   You correctly answered: b. decreased because [H+ ] increased.

Review Sheet Results

1. Describe what happened to the concentration of ions in the urine when the PCO2 was lowered. How well did the results
   compare with your prediction?
   Your answer:
   H+ decrased and HCO3- increased, as predicted.

2. What condition was simulated when the PCO2 was lowered?
   Your answer:
   Alkalosis.

3. Describe what happened to the concentration of ions in the urine when the PCO2 was raised. How well did the results
   compare with your prediction?
   Your answer:
   H+ incresed and HCO3- decreased, as predicted.

4. What condition was simulated when the PCO2 was raised?
   Your answer:
   Acidosis.