Inhaled and exhaled air

Inhaled [Inhaled: Breathed in. ] air contains:

• more oxygen used to create energy
• less carbon dioxide than…

Exhaled [Exhaled: Breathed out. ] 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 [Gas exchange: Oxygen passes through the capillary wall and into the tissues; carbon dioxide passes from the tissues into the blood. ] takes place by diffusion in the alveoli within the lungs. As a result the composition of inhaled and exhaled air is different.

Gas exchange

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