Question

The table below shows the differences between inhaled air and exhaled air:


Answer the following questions with respect to exhaled air:

1. Why has its oxygen content decreased?
2. Why is there no change in the percentage of nitrogen?

Answer 1

1. The oxygen content has decreased because its used up during the process of cellular respiration.
2. There is no change in the percentage composition of nitrogen because its not used during the process respiration.