Question

Most oxygen is carried by the blood __(i)__. Most carbon dioxide is carried by the blood __(ii)__.

• A. (i) attached to haemoglobin. (ii) in the form of bicarbonate ions.
• B. (i) dissolved in plasma . (ii) dissolved in plasma.
• C. (i) in the form of $H^{+}$ ions . (ii) in the form of bicarbonate ions.
• D. (i) attached to haemoglobin (ii) attached to haemoglobin.

Answer 1

Answer: (A)

Most oxygen is carried by haemoglobin and most carbon dioxide is carried as bicarbonate ions.