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RE: Human Anatomy 101 - The Heart (Basics)
So if I understand your question correctly then you're asking about gas exchange in the lungs?
When blood reaches the lungs, it doesn't have much oxygen in it. The blood is very close to the air in the alveoli and as such a concentration gradient is in place, meaning oxygen can passively diffuse across into the blood.
At the same time, as blood reaches the lungs it's high in CO2. This is a 'bad' gas and it diffuses OUT of the blood and into the air in the lungs at the same time.
Now as blood travels around the body the oxygen it's picked up in the lungs slowly leaves the blood and enters the cells. In the cell's the oxygen is 'used' and converted to CO2 which is picked up and brought back to the lungs.
Does this answer your question? :)
Thanks. On reading your great answer , I see my question was dumb.....As we breathe in oxygen is transferred into the blood, as we breathe out bad gasese are explelled. It was the breathing in and out part Id forgotten when I asked the question.
Its bloody clever when you think about it at this level !
Have a great weekend, and now Im hooked, expect more dumb questions soon :-)
Haha no problems mate! And no question is dumb, we all have to ask them at some point! Better to ask and learn then to remain ignorant! :)