Acid Base Balance 100 Question
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Which body system plays the primary role in regulating carbon
dioxide levels in acid-base balance?
A. Digestive system
B. Muscular system
C. Respiratory system
D. Integumentary system
Answer: C. Respiratory system
Rationale: The respiratory system regulates acid-base balance by
controlling the elimination of carbon dioxide (CO₂) through
ventilation. Increased respirations remove excess CO₂, reducing
acidity, while decreased respirations retain CO₂, increasing acidity.
2. What is the normal arterial blood pH range?
,A. 6.8–7.0
B. 7.15–7.25
C. 7.35–7.45
D. 7.50–7.60
Answer: C. 7.35–7.45
Rationale: Normal arterial blood pH ranges from 7.35 to 7.45. Values
below 7.35 indicate acidosis, while values above 7.45 indicate
alkalosis.
3. Which electrolyte is most closely associated with acid-base
balance?
A. Calcium
B. Sodium
C. Potassium
D. Magnesium
Answer: C. Potassium
Rationale: Potassium shifts are closely linked to hydrogen ion
movement. In acidosis, potassium moves out of cells, causing
hyperkalemia, while alkalosis promotes hypokalemia.
4. Which condition commonly causes respiratory acidosis?
A. Hyperventilation
B. Severe vomiting
C. Hypoventilation
D. Excess antacid use
Answer: C. Hypoventilation
Rationale: Hypoventilation leads to carbon dioxide retention,
increasing carbonic acid levels and causing respiratory acidosis.
, 5. A patient with prolonged vomiting is at risk for which
imbalance?
A. Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Metabolic alkalosis
Answer: D. Metabolic alkalosis
Rationale: Vomiting causes excessive loss of gastric acid (hydrochloric
acid), resulting in metabolic alkalosis.
6. Which organ is primarily responsible for regulating
bicarbonate levels?
A. Heart
B. Kidneys
C. Pancreas
D. Liver
Answer: B. Kidneys
Rationale: The kidneys regulate bicarbonate (HCO₃⁻) levels by
reabsorbing or excreting bicarbonate and hydrogen ions as needed.
7. Which arterial blood gas (ABG) value reflects normal
bicarbonate levels?
A. 10–15 mEq/L
B. 18–20 mEq/L
C. 22–26 mEq/L
D. 30–35 mEq/L
Answer: C. 22–26 mEq/L
, Rationale: Normal bicarbonate levels range from 22 to 26 mEq/L and
help maintain metabolic acid-base balance.
8. What is the body's fastest mechanism for compensating acid-
base imbalances?
A. Renal system
B. Respiratory system
C. Endocrine system
D. Digestive system
Answer: B. Respiratory system
Rationale: The respiratory system responds rapidly by altering
breathing rate and depth to regulate carbon dioxide levels.
9. Which condition may lead to metabolic acidosis?
A. Severe diarrhea
B. Hyperventilation
C. Excessive antacid use
D. Nasogastric suctioning
Answer: A. Severe diarrhea
Rationale: Diarrhea causes loss of bicarbonate-rich intestinal fluids,
leading to metabolic acidosis.
10. A pH of 7.30 indicates which condition?
A. Normal balance
B. Acidosis
C. Alkalosis
D. Compensation
Answer: B. Acidosis
Practice Exam Merged With Correct
Verified And Well Analyzed Answers |
Already Graded A+ | 2026 Latest
Update!!!
Which body system plays the primary role in regulating carbon
dioxide levels in acid-base balance?
A. Digestive system
B. Muscular system
C. Respiratory system
D. Integumentary system
Answer: C. Respiratory system
Rationale: The respiratory system regulates acid-base balance by
controlling the elimination of carbon dioxide (CO₂) through
ventilation. Increased respirations remove excess CO₂, reducing
acidity, while decreased respirations retain CO₂, increasing acidity.
2. What is the normal arterial blood pH range?
,A. 6.8–7.0
B. 7.15–7.25
C. 7.35–7.45
D. 7.50–7.60
Answer: C. 7.35–7.45
Rationale: Normal arterial blood pH ranges from 7.35 to 7.45. Values
below 7.35 indicate acidosis, while values above 7.45 indicate
alkalosis.
3. Which electrolyte is most closely associated with acid-base
balance?
A. Calcium
B. Sodium
C. Potassium
D. Magnesium
Answer: C. Potassium
Rationale: Potassium shifts are closely linked to hydrogen ion
movement. In acidosis, potassium moves out of cells, causing
hyperkalemia, while alkalosis promotes hypokalemia.
4. Which condition commonly causes respiratory acidosis?
A. Hyperventilation
B. Severe vomiting
C. Hypoventilation
D. Excess antacid use
Answer: C. Hypoventilation
Rationale: Hypoventilation leads to carbon dioxide retention,
increasing carbonic acid levels and causing respiratory acidosis.
, 5. A patient with prolonged vomiting is at risk for which
imbalance?
A. Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic acidosis
D. Metabolic alkalosis
Answer: D. Metabolic alkalosis
Rationale: Vomiting causes excessive loss of gastric acid (hydrochloric
acid), resulting in metabolic alkalosis.
6. Which organ is primarily responsible for regulating
bicarbonate levels?
A. Heart
B. Kidneys
C. Pancreas
D. Liver
Answer: B. Kidneys
Rationale: The kidneys regulate bicarbonate (HCO₃⁻) levels by
reabsorbing or excreting bicarbonate and hydrogen ions as needed.
7. Which arterial blood gas (ABG) value reflects normal
bicarbonate levels?
A. 10–15 mEq/L
B. 18–20 mEq/L
C. 22–26 mEq/L
D. 30–35 mEq/L
Answer: C. 22–26 mEq/L
, Rationale: Normal bicarbonate levels range from 22 to 26 mEq/L and
help maintain metabolic acid-base balance.
8. What is the body's fastest mechanism for compensating acid-
base imbalances?
A. Renal system
B. Respiratory system
C. Endocrine system
D. Digestive system
Answer: B. Respiratory system
Rationale: The respiratory system responds rapidly by altering
breathing rate and depth to regulate carbon dioxide levels.
9. Which condition may lead to metabolic acidosis?
A. Severe diarrhea
B. Hyperventilation
C. Excessive antacid use
D. Nasogastric suctioning
Answer: A. Severe diarrhea
Rationale: Diarrhea causes loss of bicarbonate-rich intestinal fluids,
leading to metabolic acidosis.
10. A pH of 7.30 indicates which condition?
A. Normal balance
B. Acidosis
C. Alkalosis
D. Compensation
Answer: B. Acidosis
