respiration
Storyboard Text
- Yes, ofcourse they do. All living beings carry out respiration, remember?
- But, then, do the trees not respire?
- Plants exchange gases through stomata.Carbon dioxide and oxygen are exchanged in and out of the cells by the process of diffusion.
- And... uh... what about animals? Phew, I learnt all this years ago. I can't recall.
- Fish take in water through their mouths and force it to the gills from where the dissolved oxygen is absorbed by blood. Insects take in air through spiracles, and goes into the tracheae.
- Yes, and mammals have lungs!
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