<P> Incas were able to adapt to their high - altitude living through successful acclimatization, which is characterized by increasing oxygen supply to the blood tissues . For the native Inca living in the Andean highlands, this was achieved through the development of a larger lung capacity, and an increase in red blood cell counts, hemoglobin concentration, and capillary beds . </P> <P> Compared to other humans, the Incas had slower heart rates, almost one - third larger lung capacity, about 2 L (4 pints) more blood volume and double the amount of hemoglobin, which transfers oxygen from the lungs to the rest of the body . While the Conquistadors may have been slightly taller, the Inca had the advantage of coping with the extraordinary altitude . </P>

What do the aztec maya and inca have in common