Question

Each haemoglobin molecule can carry

• A. two molecules of $O _{2}$
• B. three molecules of $O _{2}$
• C. four molecules of $O _{2}$
• D. one molecule of $O _{2}$

Answer 1

Answer: (C)

Each haemoglobin (Hb) molecule can carry a maximum of four molecules of $O _{2}$.
$Hb _{4}+4 O _{2} \rightarrow Hb _{4} O _{8}$
Haemoglobin is a red coloured iron containing pigment in the RBCs. Oxygen can bind with haemoglobin in a reversible manner to form oxyhaemoglobin $\left( Hb O _{2}\right)$.