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Biology study guide- Exchange surfaces and breathing



Surface area: volume ratios
Calculation- surface area/ volume to get surface area compare to volume = 1
Smaller animals have a greater surface area to volume ration than larger animals.
A larger surface area to volume ratio allows for more exchange of substances.…

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Biology study guide- Exchange surfaces and breathing



Expiration- Passive process
The diaphragm relaxes
The external intercostal muscles relax lowering the ribs
These relaxations decrease the area of the lungs( compress the lungs)
Which increases the pressure inside the lungs
Forces air out of the lungs

Key Words
-Tidal volume- the…

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