What causes the increase in the number of red blood cells in humans at high altitudes?
- Ato compensate for the low percentage saturation of haemoglobin
- Bto enable haemoglobin to unload more oxygen in the tissues by the Bohr effect
- Cto ensure that haemoglobin is almost 90% saturated when it reaches the tissues
- Dto increase the number of mitochondria in the blood for ATP production