Nitrous oxide is transported throughout the circulatory system via_____________?
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Answer: C. Red Blood cells
Explanation
Nitrous oxide is a gas with low blood and tissue solubility properties. Upon alveolar diffusion, the gas molecules dissolve directly into red blood cells. Plasma also carries a fraction of the dissolved gas throughout the circulatory system. Inhalation anesthetics cross the alveolar-capillary membrane via simple passive diffusion. Red blood cells provide a favorable medium for transporting lipophilic gas molecules. The circulatory system rapidly distributes dissolved anesthetic gases to well-perfused organs.
Rapid uptake and distribution account for the fast onset of nitrous oxide sedation. Low blood solubility ensures equally rapid elimination upon discontinuing gas administration. Anesthesiologists monitor inspired and expired gas concentrations continuously during procedures. Option A haemoglobin binds oxygen and carbon dioxide rather than nitrous oxide gas. Option B white blood cells function in immune defense rather than gas transport. Option D serum alone is insufficient for the total volume of gas carried.
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