Multiple choice

Which gas inhibits the blood's ability to carry oxygen to vital organs?

  1. Carbon dioxide

  2. Carbon monoxide

  3. Nitric oxide

  4. Ammonia

  5. Methane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon monoxide inhibits the blood's ability to carry oxygen to body tissues including vital organs such as heart and brain. When CO is inhaled, it combines with the oxygen carrying haemoglobin of the blood to form carboxyhaemoglobin (COHb). Once combined with the haemoglobin, the haemoglobin is no longer available for transporting oxygen.  

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