Question

samples of atmospheric air and exhaled air were analysed by four groups of students for oxygen and carbon oxide content. The following are results expressed in volumes per thousand.
1 Amount of oxygen in atmosphere=200
2 Amount of oxygen in exhaled air =160
3 Amount of carbon oxide in atmosphere =300
4 Amount of carbon oxide in exhaled air =41
explain the difference in volume of each gas between the atmosphere and the exhaled air

Answer 1

Answer:

Inhaled and exhaled air

Inhaled air contains:

more oxygen used to create energy

less carbon dioxide than…

Exhaled air which contains:

more carbon dioxide produced as a waste product of energy production

less oxygen as it has been used in respiration

Gas exchange takes place by diffusion in the alveoli within the lungs. As a result the composition of inhaled and exhaled air is different.

Percentage of gas present in inhaled and exhaled air:

Oxygen2116

Carbon dioxide0.044

Nitrogen7979

NB These figures are approximate.