Gas Exchange in the Human Body

By Max Mar 8C Science Mrs. Hennard

The Start of the Gas Exchange

INHALINGThe start of the gas exchange is inhaling. This is when you breathe in through your mouth or nose.When the air is breathed in through the mouth it travels down the trachea to the bronchi.

In the Lungs After reaching the bronchi, the air is split

between the two lungs. Then the air flows in to the lungs and enters the bronchiles, then is split between the alveoli…

What are the AlveoliThe air travels to the bronchioles. It is then spread to the Alveoli

are small sacks in the lungs that have blood cells running through them. Alveoli are named after the Latin word for ‘grapes’

Inside the Alveoli Inside the Alveoli is where the gas is

exchanged. The oxygenated air enters the alveoli from the lungs and the oxygen travels through a one-cell thick wall of the capillaries to the veins and is then taken to the heart, oxygenated.

Inside the Alveoli Cont. Then the left over carbon dioxide (CO2) is

transported out of the alveoli and taken back out of the lungs. Then it is exhaled and more air is inhaled and the hole process starts again

The Air we Breathe The air we breathe is made up of 4 main gases Approximately 78% Nitrogen Approximately 20% Oxygen Approximately 1% Argon <1% Carbon Dioxide <1% A combination of numerous other gases

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