Why are we breathing?
373695
oxygen is needed to convert glucose into energy.Without oxygen the body cant make energy without making lactic acid as well. Thats why you get stitches when you run out of breath. Didnt you pay attention in biology?
95196
isnt it obvious? we cant breath underwater.. unless we have gills like the fishes!!!
804283
It seems self-explanatory. There is a price to be paid for everything, including the breath we take. Did you know that one reason for cell-degeneration (namely aging) is because we are oxygen-breathers? Oxygen causes us to 'rust' in pretty much the same way it does iron and other metals. So, even the breath we take is not free, we pay for it with every cell that dies.
646052
Wind from our lungs passes through our voice box and mouth and tongue and lips and here it is. Most of the time most people use their brain to create that sound but not always works out that way.
784557
It's your body trying to absorb more oxygen into your bloodstream, allowing for more energy.
784574
the brain is the largest consumer of oxygen in our body, though it is one of the smallest organs .......brain requires lot of oxygen every minute and the availability of oxygen therefore infleuences the working of brain\n\nwhen we retain our breath, level of oxygen entering our body is minimised.....As a result, the brain doent get sufficient oxygen and the thinking process slows down
560650
haha the answer above me is funny...what what exactly do you want to know about it? theres a lot to do with respiration...theres inspiration where the air is taken in..this is caused by a contraction of the diaphragm..thens there structures like the epiglotis, trachea, pharynx...then the oxygen goes to your lungs..where gas exchange occurs in the alveoli's...this is done by some complicated process that i dont understand really..i didnt really pay attention during this part of physiology/biology class. haha. anyway, the oxygen is picked up by the pulmonary artery and goes to the rest of the body through the aorta...uhh, i can think of anything else..hope this helps!
507205
Wait...doesn't everyone in the world already breathe at the same time?  \n\nAre you trying to say that if some people weren't swimming under water or having a breath holding contest, we'd run out of air?  Wow-I thought I came up with some crazy stuff.\n\nI'm going with no on this one.
586280
We don;t necessarily know why humans yawn, whether its to increase oxygen intake, equalize barometric pressure...  We're not sure.  While you're asleep, however, the environmentmay not change all that much, and your body doesn't need a yawn to readjust.  If the reason we yawn is for increased oxygen, then the slower, deeper breaths keep the blood oxygen at an acceptable level.  If it's because of the barometric pressure, presumably it's not changing rapidly enough to force our bodies to make a gross adjustment like on an airplane.  If it's for another reason that we yawn... Well, I guess the sleep state preserves that, too.
894876
So they can breath. Their lungs aren't nearly as efficient as ours so they still require to breath through their skin, this can only be done on moist surfaces (this is also why our lungs are moist).
634762
Airway, Breathing, Circulation
649210
Because we are finsihed....
155422
To protect us from their germs and bad breath, and to protect themselves from ours.
156690
This is for the same reason that it remains longer if we exercise. The blood is diverted to where it needs to go; the lungs. Increased activity means an increased need for respiration, e.g. you need more oxygen!
205103
They evolved lungs which enabled them to breathe air.
227115
air is moved into the lungs
256721
the respiratory system