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Why Do Humans Breathe? By Irrvin

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guildford public

on 12 November 2013

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Transcript of Why Do Humans Breathe? By Irrvin

Why Do Humans Breathe?
Why Do Humans Breathe?
Humans breathe because we need oxygen to survive and our cells inside us need oxygen to asorb energy from the food we eat
What Happens First?
Firstly when you breathe you take in oxygen and air inside your lungs. Nest the oxygen you breathe gets picked up by your new bloodcells going in from your heart.
Why Can't You Hold Your Breath Forever?
A gas called carbon dioxide is a waste product by your cells. It goes inside your lungs ready to breathed out. This is what you breathe out and it is dangerous to hold it in because it builds up inside your lungs. This is why you can't hold your breath forever.
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