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what causes us to breathe

Human Anatomy, Physiology, and Medicine. Anything human!

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Postby sdekivit » Mon Dec 26, 2005 12:11 pm

MrMistery wrote: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?


it's the hypoxia in the brains that a person loses its conciousness and then the breathing muscles are stimulated both by too high pCO2 and too low pO2 via the peripheral and central chemoreceptors.

Note that the cortical impulses of the brain are involved in willingly holding ones breath.

But most of the time it's the pCO2 and the pH that give THE impulses to the medulla, because peripheral chemoreceptors only respond to an oxygen level below the 60 mmHg.
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Postby victor » Mon Dec 26, 2005 12:40 pm

wow..cool explanations..I'll note that in my notebook..:mrgreen:
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Postby Poison » Tue Dec 27, 2005 7:13 am

I liked the explanation. :)
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Postby kandarp shah » Fri Dec 30, 2005 4:59 pm

well,
i just know that breathing and all other automatic process that take place in our body are handle by the BRAIN STEM, the bundle of neurons that connects the two cerebellum hemisphere.
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Postby victor » Sun Jan 01, 2006 12:00 pm

Yup, that's why you can't kill yourself just by pressing your nose and hold your breath...it's automatic...
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Postby sdekivit » Sun Jan 01, 2006 10:01 pm

kandarp shah wrote:well,
i just know that breathing and all other automatic process that take place in our body are handle by the BRAIN STEM, the bundle of neurons that connects the two cerebellum hemisphere.


and that these impulses can be influenced by a persons will and these impulses come from the cortex
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Postby Navin » Tue Jan 03, 2006 1:32 pm

A fact: When a person is exposed to 100% oxygen, his/her breathing rate decreases.
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Postby sdekivit » Tue Jan 03, 2006 5:48 pm

Navin wrote:A fact: When a person is exposed to 100% oxygen, his/her breathing rate decreases.


of course it does ;) 100% O2 causes a decrease in pCO2 and thus less firing of the chemoreceptors and thus a less sympathetic innervation of the breathing muscles :)
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Postby MrMistery » Wed Jan 04, 2006 9:06 pm

it is logical for it to decrease. think of it like this: 100 O2 will have a greater pressure than air, meaning more oxygen is transported, meaning it is not necessary for the heart to pump blood as fast as it used to. Mechanism stated by sdekivit
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Re: what causes us to breathe

Postby gardengirl7787 » Sun Oct 06, 2013 9:58 pm

Healthy persons breathe because of the increase of CO2 levels-which is the stimulus.
A person with COPD for example breathes when the O2 level gets too low, so it is important to monitor how much oxygen (if any) the person is on closely. Too much O2 can cause the drive to breathe to stop.
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Postby TYLS » Thu Oct 10, 2013 2:29 pm

i'm with victor on his guess about the pH having a role.
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Postby zak » Thu Nov 21, 2013 10:20 am

i need help plz i did it in this way is that correct
Consider the causes of left-sided heart failure:
Choose one phrase from those available to correctly accompany, each of the factors a-e.
Drag and drop the phrase into the appropriate box. Each phrase may only be used once.
a. Breathlessness (reduces the oxygen carrying capacity of the blood)
b. An overactive thyroid gland (increases the metabolic demand by the tissues.)
c. Stenosis of the mitral valve (causes damage to heart muscle.)
d. Diabetes (is associated with weight gain )
e. Calcification of the tricuspid valve (reduces the left cardiac output. )

shunts unoxygenated blood directly from the right to the left side of the circulation.
causes regurgitation between atrium and ventricle.
reduces the oxygen carrying capacity of the blood.
is a symptom, not a cause.
is not associated with left sided heart failure.
is associated with weight gain
increases the metabolic demand by the tissues.
causes damage to heart muscle.
reduces the left cardiac output.
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