October 19th, 2005

System Air
How do parts of the breathing system cause air to move into the lungs?

i.e what causes the whole breathing system to do what it does?

what do the ribs do?

volume?

air pressure?

intercostal muscles?

You can get into the nitty gritty of it if you wish but at its most basic level it’s about your diaphragm.
Inside your lungs when your breathing out you diaphragm compresses (lowering the room for air, causeing high pressure which is quickly releaved by the air being released as you exhale). And when you breath in your diaphram expands, meaning more room for the air. If you get into the physics of it, this sudden increase in volume means a large decrease in air pressure (because enlarging doesn’t change the volume). This change causes the air outside your body to come gushing in (due to natures unquenchable thurst to equalise anything and everything)

As for the rest of your question (i hope above was sufficent)

your ribes, like all of your skeletal system, are for support – they keep us rigid isntead of a blobby mess on the ground. The ribs don’t play a notable roll in this process and for the most part just chill and watch the body do its thing.

As for the intercostal muscles; they are the muscles that make up the diaphragm (although that isn’t all they are responsable for, in this context though we will stick to the diaphragm). They are what push and pull the diaphram causing it to expand and compress.

How exactly they do that is much deeper and for the sake of this question i believe my previous statments should surfice. I hope this information helps you.

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