Analysis of the experimental spirogram of a 55-year-old person revealed a decrease in tidal volume and respiratory amplitude compared to the situation of ten years ago. The change in these indicators is caused by:

Answer options

1. Height of a person
2. Decreased force of respiratory muscle contraction
3. Physical build of a person
4. Body mass of a person
5. Gas composition of the air

Explanation

Old age causes a decrease in muscle force and contraction so with time tidal volume will be decreased.