Question 1

What does a PaCO₂ level above 45 mmHg typically indicate?

Accepted Answer

Respiratory acidosis

Answer

Metabolic acidosis

Answer

Respiratory alkalosis

Answer

Metabolic alkalosis

Question 2

What is the primary physiological role of carbon dioxide (PaCO₂) in the blood?

Accepted Answer

Regulating acid-base balance

Answer

Stimulating red blood cell production

Answer

Providing energy

Answer

Transporting oxygen

Question 3

In a patient with a PaCO₂ level of 30 mmHg, what condition is most likely to be present?

Accepted Answer

Respiratory alkalosis

Answer

Metabolic acidosis

Answer

Metabolic alkalosis

Answer

Respiratory acidosis

Question 4

What is the normal range for arterial PaCO₂ levels in healthy adults?

Accepted Answer

35-45 mmHg

Answer

50-60 mmHg

Answer

25-35 mmHg

Answer

45-55 mmHg

Question 5

Which of the following conditions can lead to an elevated PaCO₂ level?

Accepted Answer

Chronic obstructive pulmonary disease (COPD)

Answer

Anemia

Answer

Hyperventilation syndrome

Answer

Asthma attack

Question 6

What compensatory mechanism occurs in the kidneys in response to chronic respiratory acidosis?

Accepted Answer

Increased HCO₃⁻ reabsorption

Answer

Decreased H⁺ secretion

Answer

Increased H⁺ secretion

Answer

Decreased HCO₃⁻ reabsorption

Question 7

What might a sudden drop in PaCO₂ indicate during a clinical assessment?

Accepted Answer

Hyperventilation

Answer

Respiratory failure

Answer

Acute respiratory distress syndrome (ARDS)

Answer

Hypoventilation

Question 8

What is the primary effect of a high PaCO₂ level on the central nervous system?

Accepted Answer

Depression of respiratory drive

Answer

Stimulation of neural activity

Answer

Enhanced cognitive function

Answer

Increased metabolic rate

Question 9

Which lab finding would most likely accompany a low PaCO₂ level due to hyperventilation?

Accepted Answer

Low bicarbonate (HCO₃⁻) level

Answer

Increased lactate levels

Answer

Normal oxygen (PaO₂) level

Answer

High bicarbonate (HCO₃⁻) level

Question 10

What happens to the PaCO₂ level during hypoventilation?

Accepted Answer

It increases

Answer

It fluctuates erratically

Answer

It remains unchanged

Answer

It decreases

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