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Organisms exchange substances with their environment (AQA AS
Biology) PART 4 of 5 TOPICS


Mass transport in animals:
Haemoglobin is a protein which has a quaternary structure.

Each haemoglobin molecule can carry up to 4 oxygen molecules. Oxyhaemoglobin is formed when
oxygen attaches to haemoglobin. The binding of haemoglobin with…

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used to prevent friction. Arteries carry blood away from the heart to respiring cells. NB: Not
all arteries carry oxygenated blood as illustrated in the heart diagram.
Veins: Blood in the veins are under low pressure therefore the walls of the veins are thin and
also they have thin muscle…

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