Posted by **so CONFUSED!** on Monday, February 15, 2010 at 3:00am.

Under which condition can you hold your breath longer?

First breathe in as much as you can and hold your breath, and time it. (Lungs completely inflated)

After, breathe out as much as you can, hold your breath, and time it. (Maximal expiration).

Which condition can you hold your breath longer? Why?

I'm trying to relate all of this with chemoreceptors for carbon dioxide and oxygen. I would really appreciate a useful resource.

- Biology -
**dongo**, Monday, February 15, 2010 at 5:17am
Hint: After breathing air, there is still a sufficiently high ration of oxygen in it in order to breathe it two times again.

- Biology -
**so CONFUSED!**, Monday, February 15, 2010 at 9:31pm
That makes sense, that there is enough oxygen to supply the body for a longer time, however, I thought the body senses CO2 more, so after maximal exhalation, the CO2 decreases in blood, and you can hold your breath longer?

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