«While an adult human brain typically weighs only about 2 % of the body weight, a resting brain consumes more
than 20 % of all the
oxygen, thus indicating a 10-fold greater energy requirement
than other tissues.
Since almost all body
tissues consume
oxygen, although some
tissues more
than others (i.e. muscle consumes more
oxygen than fat), a person with a larger total body mass will be much more likely to consume more total
oxygen than a person with a lower total body mass.