Question

Rewrite and complete the following sentence by inserting the correct word.

Oxygen combines with haemoglobin present in RBCs and forms ______.

Answer 1

Oxygen combines with haemoglobin present in RBCs and forms oxyhaemoglobin.

Explanation:

Oxyhaemoglobin is a bright red, unstable chemical complex formed when oxygen molecules bind reversibly to the iron ions inside the haemoglobin protein. This specific binding occurs in the lungs where the oxygen concentration and partial pressure are exceptionally high. As blood circulates to the body tissues where oxygen levels are low, the complex safely dissociates, releasing the oxygen to fuel cellular respiration.