Editing Bipedalism (section)

===Respiration===
[[File:Human respiratory system pedagogical fr.svg|thumb|166x166px|The human respiratory system, encased by the rib cage]]
[[Quadrupedalism|Quadrupeds]], have more restrictive breathing [[Respiration (physiology)|respire]] while moving than do bipedal humans.<ref name=":02">{{Cite book |last=DeSilva |first=Jeremy |title=First Steps: How Upright Walking Made Us Human |publisher=Harper Collins |year=2021 |location=New York}}</ref> "Quadrupedal species normally synchronize the locomotor and respiratory cycles at a constant ratio of 1:1 (strides per breath) in both the trot and gallop. Human runners differ from quadrupeds in that while running they employ several phase-locked patterns (4:1, 3:1, 2:1, 1:1, 5:2, and 3:2), although a 2:1 coupling ratio appears to be favored. Even though the evolution of bipedal gait has reduced the mechanical constraints on respiration in man, thereby permitting greater flexibility in breathing pattern, it has seemingly not eliminated the need for the synchronization of respiration and body motion during sustained running."<ref>{{cite journal |last1=Bramble |first1=Dennis |title=Running and Breathing in Mammals |journal=Science |date=1983 |volume=219 |issue=4582 |pages=251–256 |doi=10.1126/science.6849136 |pmid=6849136 |bibcode=1983Sci...219..251B |url=https://www.science.org/doi/10.1126/science.6849136 |access-date=28 August 2022}}</ref>

Respiration through bipedality means that there is better breath control in bipeds, which can be associated with brain growth. The modern brain utilizes approximately 20% of energy input gained through breathing and eating, as opposed to species like chimpanzees who use up twice as much energy as humans for the same amount of movement. This excess energy, leading to brain growth, also leads to the development of [[Linguistics|verbal communication]]. This is because breath control means that the muscles associated with breathing can be manipulated into creating sounds. This means that the onset of bipedality, leading to more efficient breathing, may be related to the origin of verbal language.<ref name=":02"/>