respiratory

[saab]

explain gaseous exchange in the lungs?

[gen2]

Does your school not teach you manners? It doesn't come across very well when you just demand an explanation.

In my day homework was always something you attempted yourself. By all means come on here later to seek clarification of something you don't understand and you will then find people here more willing to help those who show they have already made an effort.

[whowhatwhy]

or how about doing some research yourself?! Ever heard of google?

[crete]

i hope someone helpful will answer your question.

[Its John!]

how many marks is it? or how much detail have u gotta give?

air is inhaled into the lungs, so there is plenty of oxygen in the lungs. gas exchange happens in the alveoli (tiny sacs in lungs). As there is a higher concentration of oxygen in the lungs than in the surounding blood vessels (capillaries), most of the oxygen molecules will passively diffuse into the blood. There is a higher concentration of carbon dioxide in the blood than in the alveoli, so CO2 passively diffuses into the alveoli, so it can be exhaled.

[mrs_overall]

Sheesh, if this is how students do their homework these days...rudely demanding answers...what hope is there? I don't know if you are doing KS4 science or AS level but there are a trillion sites to help you if you Google.