Apnea

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biology_06er
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Apnea

Post by biology_06er » Sat Mar 31, 2007 7:01 am

Could someone please tell me why when we hold our breath in air for say 30seconds our heart rate doesn't chang emuch..is it due to the fact that for that time the body has enough oxygen for the body to use and hence the same about of blood is is being supplied to the heart and hence the same HR? also holding breath in warm water doesn't change much. why?..is it beacuse theres no recpetors on the face stimulated by warm water and that the fact the (according to the person who carried out the experiemnt in our group) it feels as though you are just in air and it doesn't feel as though there is a stimulus? i dunno lol... :?
it also tells us to talk about environmental factors that can explain differences between holding breath in dive in water and air-are these things like in water you are 'in the unknown' its dark etc (haha prob not) and when holding your breath in air you are aware of the things going on around you?


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Revenged
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Re: Apnea

Post by Revenged » Sat Mar 31, 2007 10:56 am

Heart rate is usually controlled automatically by the part of the brain stem called the medulla and relies on many factors such as the carbon dioxide concentration of the blood...

When you consciously hold your breath it is going to involve 'higher brain functions'... Obviously the normal physiological mechanisms would not apply when you are holding your breath because it would not make sense to be wasting energy increasing the heart rate when the blood you're are pumping around is already deoxygenated...

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