Gas exchange
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Gas exchange in fish
From S-cool site, page of information with animations on gas exchange in fish, includes countercurrent mechanism.
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Grasshopper breathing
Quick Youtube clip of grasshopper breathing movements.
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Lesson on surface area and volume
Teachers notes for a lesson – but you can link from here to an interactive “try out different surface areas and find out what the volume is” page
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Respiratory system
Tutorial from Virtual Autopsy site
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Respiratory system in insects
Youtube clip with animation and voiceover explaining tracheoles etc.
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Take a deep breath
Article on gas exchange in various living organisms.