2.59 Explain how adaptations of red blood cells, including shape, structure and the presence of haemoglobin, make them suitable for the transport of oxygen

ADAPTATIONS TO SHAPE
Have a biconcave shape (flat disk with a dip in the middle) which increases the surface area (this allows more oxygen to be absorbed more efficiently). Also, the fact that they are a flat disk allows them to pass through capillaries easily :)

NO NUCLEUS
This means the whole cell is full of haemoglobin

THIN OUTER MEMBRANE
Which lets oxygen diffuse through easily

HAEMOGLOBIN
(It's made from iron), and can bond with oxygen (very important for cell whose job is to carry around oxygen)

NO MITOCHONDRIA
Because the cells respire anaerobically so the cells don't use any oxygen.