2006-09-05 14:39:23 · 10 answers · asked by Britt 1 in Health ➔ Other - Health
Because we evolved near sea level on the planet Earth where oxygen is prentiful. I suppose other molecules may be able to replace oxygen, but oxygen must be better and those that did not use oxygen near sea level on planet Earth were killed by those that did. I guess deep sea organism may be different.
2006-09-05 14:48:56 · answer #1 · answered by Mack L 3 · 0⤊ 0⤋
Think of human bodies like a combustion engine. Just like you need gasoline (in gaseous form) to run a car you need oxygen for the metabolic processes in your body. Without oxygen your cells wouldn't be able to get the energy they need.
2006-09-05 14:48:22 · answer #2 · answered by Daniel G 2 · 0⤊ 0⤋
We breathe oxygen. You cant go more than a minute without air. your Lungs need it. your Blood is Flowing in the lungs. Blood, Then go's to the brain, heart. etc. blood W/ oxygen mixed together go's all over your body. Your brain needs it. IT HAS TO HAVE IT! oxygen is important.
2006-09-05 14:51:36 · answer #3 · answered by mr_know_it_all_12345 3 · 0⤊ 0⤋
The guy who compared us to combustion engines isn't far off. We use oxygen to oxidize things like glucose:
C6H12O6 + 6O2 --> 6H2O + 6CO2 + energy
In combustion, the energy is mostly released as heat. Except for keeping us warm, heat is essentially useless so we don't really want to do that. In our bodies the oxidation process is broken into several discrete steps that are coupled with ATP generation. Instead of releasing all of that energy in one bright flash, we store the energy into ATP molecules that can be used to drive various cellular processes that require energy.
We have evolved to use oxygen as our oxidizing agent -- presumably because it is plentiful in our environment. Other organisms living in strange environments have evolved to use other oxidizing agents....
2006-09-05 15:26:15 · answer #4 · answered by grimmyTea 6 · 0⤊ 0⤋
Humans need oxygen to produce energy for their daily functions..(walking, thinking, talking, etc..) .. Energy is produced by the carbohydrates from the food we eat. Oxygen is required to break down the carbohydrates into carbon dixoide and water to release energy.
2006-09-05 14:50:45 · answer #5 · answered by dimensionr2002 2 · 1⤊ 0⤋
the main purpose of oxygen is to act as a free radical accepter. at the end of electron transport system a free radical is released which if not controlled can destroy the cell. it happens only in aerobic metabolism. thus only aerobic organism needs oxygen
2006-09-05 14:46:09 · answer #6 · answered by Gundruk 3 · 1⤊ 0⤋
our lungs use oxygen to make sure our organs work in perfect working order . . .and give out oxygen . .
not all organism uses oxygen man . . .plants use CO2 ...
2006-09-05 14:50:04 · answer #7 · answered by megadisc 4 · 0⤊ 0⤋
\we need oxygen because the way we breath in and out helps our blood move.
2006-09-05 14:52:00 · answer #8 · answered by Bengi F 2 · 0⤊ 0⤋
all organisinms need oxyegen to survive
2006-09-05 14:43:15 · answer #9 · answered by Anonymous · 0⤊ 1⤋
ask God when you die
unless you don't believe, in which case, you will never know
2006-09-05 14:46:34 · answer #10 · answered by one_sera_phim 5 · 0⤊ 1⤋