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Surfaces for Exchange…read more

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Inhaling (Inspiration) Exhaling (Expiration)
Diaphragm contracts to become flatter and Diaphragm relaxes and is pushed up by
pushes digestive organs down. displaced organs underneath.
External intercostal muscles contract to External intercostal muscles relax and ribs
raise ribs. fall.
Volume of chest cavity increases. Volume of chest cavity decreases.
Pressure in chest cavity drops to below Pressure in lungs increases and rises to
atmospheric pressure. above atmospheric pressure.
Air moves into lungs. Air moves out of lungs.…read more

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Tissues in the Lungs…read more

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Measuring Lung Capacity…read more

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Transport in Animals…read more

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The Mammalian Heart…read more

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The Cardiac Cycle…read more

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Controlling the Cardiac Cycle…read more



Fantastic resource, really good for the new linear Alevels, makes everything clear and not over complicated! :) 

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