How does oxygen affect brain size?

Oxygen plays a critical role in brain development and size. Jack Feldman highlights how oxygen intake is facilitated by the structure of the diaphragm, which helps achieve efficient oxygen absorption essential for brain development. This efficient oxygen uptake through the diaphragm is crucial for maintaining the high oxygen demand of large mammals' brains, including humans. The constant demand for oxygen by the brain supports its health and capability, influencing its larger size compared to other mammals who may not have a diaphragm or similar efficient breathing mechanisms 1.