Most of the carbon dioxide transported in the blood is carried:
Dissolved in plasma
Bound to hemoglobin
Bound to albumin
In the form of bicarbonate ions
The Correct Answer is D
A. A small amount of carbon dioxide is transported dissolved in plasma, but this accounts for only about 5–10% of the total CO₂ in the blood.
B. Some carbon dioxide binds to hemoglobin to form carbaminohemoglobin, but this form carries only about 20–30% of CO₂.
C. Albumin primarily transports hormones, fatty acids, and other substances—not carbon dioxide.
D. The majority of carbon dioxide (about 60–70%) is carried in the blood as bicarbonate ions (HCO₃⁻). This occurs through a reaction where CO₂ combines with water to form carbonic acid, which then dissociates into bicarbonate and hydrogen ions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Hypercapnia refers to elevated levels of carbon dioxide (CO₂) in the blood, which can occur due to respiratory problems or insufficient ventilation.
B. Hypoxemia is a condition where there is low oxygen in the blood, not related to carbon dioxide levels.
C. Hypocapnia refers to low levels of carbon dioxide in the blood, often caused by hyperventilation.
D. Hypoxia refers to low oxygen levels in the tissues, not the blood levels of carbon dioxide.
Correct Answer is B
Explanation
A. Esophagus passes through the mediastinum and lies posterior to the trachea and heart.
B. Lungs are not part of the mediastinum; they are located in the pleural cavities on either side of the mediastinum.
C. Heart is located centrally within the mediastinum, specifically in the middle mediastinum.
D. Lymph nodes are present in the mediastinum and are part of the immune and lymphatic systems
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