Rib cage pulled upward and outward diaphragm pulled downward

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rib cage pulled upward and outwardrib cage pulled upward and outwarddiaphragm pulled downwardInhalation

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Now, well see how we exhale or breathe out.

Exhalation2

When the muscles between the ribs relax, the rib cage moves downward and inward.

Exhalationrib cage moves downward and inwardrib cage moves downward and inward3

And when the diaphragm muscles relax, the diaphragm moves upward

Exhalationrib cage moves downward and inwardrib cage moves downward and inwarddiaphragm moves upward4

Well watch this happening.

Exhalationrib cage moves downward and inwardrib cage moves downward and inwarddiaphragm moves upward5

As everything is pushing inward, we see the volume inside the chest cavity decreases.

Exhalationthe volume inside decreases6

This means the pressure inside increases.

Exhalationthe pressure inside increases7

Now, the pressure inside the chest cavity is higher than atmospheric pressure. Remember that air moves from an area of higher pressure into an area of lower pressure.

Exhalationthe pressure inside is higher than atmospheric pressureatmospheric pressure8

So as the volume in the chest cavity decreases, air is pushed out of the lungs.

Exhalation9

So again, we dont have muscles in our lungs.

Exhalation10

It is when the muscles between our ribs and in our diaphragm relax,

Exhalationrib cage moves downward and inwardrib cage moves downward and inwarddiaphragm moves upward11

That the volume of the chest cavity is decreased and air is pushed out.

Exhalationrib cage moves downward and inwardrib cage moves downward and inwarddiaphragm moves upward12

Now, well have a look at the whole process of breathing

Breathing13

Inhalationexhalation..inhalationexhalation Of course this process continues to occur throughout our whole lifetime.

Breathing14

"Gray112" by Henry Vandyke Carter - Henry Gray (1918) Anatomy of the Human Body (See "Book" section below)Bartleby.com: Gray's Anatomy, Plate 112. Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Gray112.png#/media/File:Gray112.png

Acknowledgements for Images Used15