How is most oxygen transported in the blood?
Dissolved in plasma
By hemoglobin
By bicarbonate
By pulmonary surfactants
The Correct Answer is B
A. Dissolved in plasma- only ~1.5% of oxygen is dissolved in plasma.
B. By hemoglobin- ~98.5% of oxygen binds to hemoglobin in red blood cells.
C. By bicarbonate- this primarily transports carbon dioxide, not oxygen.
D. By pulmonary surfactants- surfactant reduces surface tension in alveoli, not related to oxygen transport in blood.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Decreased K⁺ levels: Not related to respiratory drive.
B. Increased O₂ levels: May actually suppress the drive to breathe in COPD patients.
C. Decreased CO₂ levels: Would reduce respiratory drive, not increase it.
D. Increased CO₂ levels: Correct; high CO₂ levels stimulate the respiratory center to increase breathing rate.
Correct Answer is D
Explanation
A. Hyperventilating: this means rapid, deep breathing.
B. Having difficulty breathing: that is dyspnea.
C. Experiencing Kussmaul respirations: that’s deep, labored breathing, often seen in metabolic acidosis.
D. Not breathing: apnea means absence of breathing.
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