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===Adaptations of Red Blood Cells===
: '''Red blood cells''' have a [[biconcave]] shape which maximises their [[Surface Area|surface area]] to allow [[oxygen]] to be [[Absorb (Biology)|absorbed]] quickly.
: '''Red blood cells''' have a smooth rounded edge to pass through the [[capillaries]] without getting stuck.
: '''Red blood cells''' have a large number of [[haemoglobin]] [[molecule]]s used to transport [[oxygen]].