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what causes us to breathe

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what causes us to breathe

Postby Phee » Sun Dec 18, 2005 8:55 pm

What actually causes us to start breathing, an increase in blood carbon dioxide levels or a decrease in blood oxygen levels?
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Postby Poison » Mon Dec 19, 2005 9:28 pm

Aren't they basically the same?
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Postby MrMistery » Tue Dec 20, 2005 7:30 pm

He/She is asking what stimulates the pathway. I am rather curious myself since i did not come across this info anywhere...
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Postby Poison » Wed Dec 21, 2005 8:22 pm

I couldn't think of any logical explanation too.
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Postby MrMistery » Wed Dec 21, 2005 9:02 pm

It is not a logic question, it is a question of cellular pathways and biochemistry
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Postby Poison » Wed Dec 21, 2005 9:29 pm

yes, but increase of CO2 means decrease of O2. So which one stimulates...
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Postby victor » Thu Dec 22, 2005 11:50 am

breathing is under the control of autonom nerve. When the cells and Tissues lack of oxygen, they send a chemical signals to the nervous system and 'autonom'ically, we're forced to take a breath.
Beside, there're also many other factors which get involved in this mechanism like inhibotors, pH, CO2-O2 equilibrium, etc.
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Postby MrMistery » Sat Dec 24, 2005 4:39 pm

That is what the user is asking, a very interesting question: What stimulates that nerve impulse? Excess CO2 or/and lack of O2? Of course they happen at the same time but which one works as a stimulus? My guess is just like yours victor: lack of O2. However, i have no reference to prove my theory
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Postby sdekivit » Sat Dec 24, 2005 5:32 pm

Poison wrote:yes, but increase of CO2 means decrease of O2. So which one stimulates...


the both regulate different things ;)

--> High alveolar pCO2 cause bronchioles to dilate and high alveolar pO2 cause alveolar capillaries to dilate.
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Postby Poison » Sat Dec 24, 2005 8:09 pm

I learned something new. :) Good.
But maybe the exact answer should be: both ;)
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Postby victor » Sun Dec 25, 2005 12:00 pm

My hypothesis said that it's related with the pH of the interestial fluid..excess of CO2 means little bit acidic blood plasm and I can think that's the time when signals should be transducted..
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Postby MrMistery » Sun Dec 25, 2005 4:26 pm

LOL... I understood the question in a different way. When you hold your breath, what is the thing that gets your breathing muscles started? Is it excess CO2 or a lack of oxygen?
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