Question

How are oxygen and carbon dioxide transported in the blood?

Answer 1

By attaching to an iron-based protein in the blood called haemoglobin.

Explanation:

A single haemoglobin molecule can take in 4 oxygen molecules (`O_2`).

That means 8 Oxygen atoms.

When oxygen gets attached, the haemoglobin turns red.

`CO_2` follows the same principle but there a number of other ways it is carried through the blood. The most common way is in the form of bicarbonate ions .