2006-08-30 10:17:16 · 5 answers · asked by suppppppppppp♥ 3 in Health ➔ General Health Care ➔ Other - General Health Care
We yawn because of lack of oxygen
2006-08-30 10:21:37 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Lack of oxygen. That's it. We may be tired, but we're not breathing well and the yawn makes us do so.
2006-08-30 10:27:08 · answer #2 · answered by Barbara A 2 · 0⤊ 0⤋
We yawn when our CO2 (carbon dioxide) level in our blood gets too high and regular breathing isn't clearing it out fast enough. Healthy peoples' oxygen levels never change, they are always the same, at around 97%-100% saturation. It's our CO2 level that makes us need to breathe.
2006-08-30 10:21:39 · answer #3 · answered by bokie318 3 · 1⤊ 0⤋
yawning is due to lack of oxygen
2006-08-30 10:23:44 · answer #4 · answered by fleurt82 2 · 0⤊ 0⤋
Because your lower jaw is then too heavy and hard to hold (as you atre tired!), so you yawn!!! It is contagious by the way!!!
2006-08-30 10:21:43 · answer #5 · answered by Antoine a 3 · 0⤊ 0⤋