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why do red blood cells have a large surface area

are small and very numerous - they are 5. 5 million per mm3 of blood
Their shape - their biconcave shape gives blood cell a larger surface area в which increases the ability to absorb oxygen. Their size - they are tiny and flexible, therefore they can squeeze through the narrowest of blood capillaries to deliver oxygen.

Haemoglobin is the oxygen carrying pigment found inside red blood cells. Haemoglobin binds with oxygen at high levels (in the lungs) and forms oxyhaemoglobin. This makes blood very red in colour! The oxygen then diffuses into the cells. The following graph demonstrates the oxygen dissociation curve. Blood is used to transport materials around the body, and to protect against disease.

Blood contains plasma Liquid, non-cellular part of the blood, a liquid that contains dissolved substances, cells and cell fragments. These include: Red blood cells, which transport oxygen White blood cells, which protect against disease Platelets, which help the blood to clot The table explains how the structure of a red blood cell is adapted to its function.

Plasma transports dissolved substances around the body, including: Nutrients, such as water, glucose, amino acids, minerals and vitamins Waste substances, such as carbon dioxide and urea

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