Red blood cells transport oxygen from the lungs to all the cells in the body.
They are specialised cells, and are therefore adapted to their function.
Their adaptations include;
- biconcave shape
- large surface area to volume ratio
- absorb and release oxygen
- no nucleus to provide more space
- contain haemoglobin which converts to oxyhaemoglobin when combined with oxygen, making it release oxygen to cells when in body tissues
- flexible to allow them to pass through narrow arteries
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