[PhysioEX Chapter 10 exercise 4] PEX-10-04

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

An increase in metabolic rate (without compensation) would result in
You correctly answered: a. more carbon dioxide in the blood.
Excessive vomiting results in
You correctly answered: c. loss of acid, metabolic alkalosis.
Which of the following is not acidic?
You correctly answered: d. antacids
Which of the following decreases the rate of metabolism?
You correctly answered: b. lowered body temperature

Experiment Results
Predict Question:

Predict Question 1: What do you think will happen when the metabolic rate is increased to 80 kcal/hr?
Your answer : a. metabolic acidosis

Predict Question 2: What do you think will happen when the metabolic rate is decreased to 20 kcal/hr?
Your answer : d. Breaths per minute will decrease.

Stop & Think Questions:
The tidal volume and breaths per minute increased with increased metabolism because
You correctly answered: b. there is more carbon dioxide being formed.
Which body system is compensating for the metabolic alkalosis?
You correctly answered: c. respiratory

Experiment Data:
Metabolic Rate
(kcal/hr)
BPM (breaths/min) Blood pH PCO2 [H+]
in Blood
[HCO3-]
in Blood
50 15 7.41 40 40 24
60 17 7.34 45 47 20
80 21 7.26 55 63 14.50
40 13 7.45 37 38 26
20 9 7.49 31 32 30

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

What happened to the breathing when metabolism was increased?
You correctly answered: d. The breaths per minute and the tidal volume increased.
Which of the following is not a cause of metabolic acidosis?
You correctly answered: b. constipation
If PCO2 in the blood increases, then
You correctly answered: a. [H+ ] increases and pH decreases.
Which of the following values increased with decreased metabolism?
You correctly answered: d. pH and [HCO3- ]

Review Sheet Results

Describe what happened to the blood pH when the metabolic rate was increased to 80 kcal/hr. What body system was
compensating? How well did the results compare with your prediction?
Your answer:
Respiratory system compensated with acidosis, as predicted.
List and describe some possible causes of metabolic acidosis.
Your answer:
Highly intensive exercise.
Describe what happened to the blood pH when the metabolic rate was decreased to 20 kcal/hr. What body system was
compensating? How well did the results compare with your prediction?
Your answer:
Respiratory system compensated, as predicted.
List and describe some possible causes of metabolic alkalosis.
Your answer:
High concentration of HCO3- cause of dehydration. Excessive removement of acid by aldosterone.