When you take in air, you're taking in oxygen (O2). When you breathe out, you let out carbon dioxide (CO2).
123837
During cellular respiration (how we turn food into energy) O2 is the final electron acceptor. BUT... the O2 is actually turned into 2 molecules of water, so the carbon does not just hop onto the O2. The CO2 comes from the breakdown of carbon-rich sugars and fats in your food. Example... Glucose has 6 carbons...as your body rips carbons off of the glycolysis products, each carbon combines with 2 oxygens to become CO2...so 1 glucose yields 6 CO2.
20745
Plants take in oxygen, carbon dioxide and water, and produce sugar which contains carbon, oxygen and hydrogen atoms from all three. So they use more water than they put out. In fact, I don't believe they "exhale" water the way we do at all,
453331
CO2 From the Air, Through the Stoma, H2O from the Xylem.
131960
Air molecule???\nThe air we breath, Oxygen Nitrogen (not nitrate, just oxygen and nitrogen), goes in through your nose down to your lungs. Your red blood cells have tiny holes on them, and they "collect' the oxygen from your lungs, back to the heart, and gets pumped everywhere through your body. Your body takes the oxygen, have a bunch of reactions with them, and sends out the "waste" (carbon dioxide, etc), which goes back to your ticker, pumps it up to your lungs, and is breathed out. \n\nPlease, don't just use that as your research paper. It is much more detailed. :P
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The lungs are a rich lattice of alveoli, which provide an enormous surface area for gas exchange. A network of fine capillaries allows transport of blood over the surface of alveoli. Oxygen from the air inside the alveoli diffuses into the bloodstream, and carbon dioxide diffuses from the blood to the alveoli, both across the exceptionally thin alveolar membranes. The drawing and expulsion of air is driven by muscular action.
21137
The urge to breath comes from the build up of CO2 in your body not the need for Oxygen. Two thinkgs you can do. first take a few really deep breaths in and out, before your dive. This slightly hyperventalates you and makes sure all CO2 is out of you body. Second if you feel the need to breath Exhale slowly. "blow bubbles"  keep it  controled. You will feel less like you need to breath. Be careful. There is a problem called shallow water black out. It comes from hyperventalating too much before you dive.  So only take a few deep breaths.\nhttp://www.scuba-doc.com/latenthypoxia.html
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becasue when you breathe outwards with your mouth closed the smoke comes out your nose and when you exhale with your mouth open it'll usually come out the mouth unless your mouth is open but you exhale through your nose. Basically the smoke comes out where ever the air is leaving your body
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All right, I'm first going to explain, briefly, the structure of the cardiovascular system, and then I'll move on to how the blood transports oxygen specifically.\n\nYour heart pumps blood from the right ventricle to your lungs, where it exchanges carbon dioxide for oxygen, and then continues to your left atria. The left atria pumps the blood to the left ventricle, which pumps blood through your arteries  to your capillaries, where the oxygen is released so that cells can use it. Carbon dioxide is picked up, and the blood continues to the veins, and back to the right atria.\n\nNow, your blood contains red blood cells, which contain two important molecules, hemoglobin and myoglobin. Both have a high affinity for oxygen, so, in your lungs, where there is a high oxygen concentration, oxygen binds to each of these two molecules (until the equilibrium point is reached). The red blood cells are pumped throughout the body. \n\nIn the body, the concentration of oxygen is lower than in the surrounding atmosphere, so the amount of hemoglobin (and myoglobin) which is binding oxygen decreases until it reaches the new equilibrium point. Active tissues use oxygen quickly, forming lots of CO2, which enters the blood, and is converted to carbonic acid by red blood cells, using the enzyme carbonic anhydrase. The change in pH lowers the affinity of hemoglobin for oxygen, so more oxygen is released from other red blood cells near working tissues. The carbonic acid is released back into the blood from red blood cells, where it dissociates into a proton (H+) and a bicarbonate ion. It travels through the blood back to the lungs, where it is converted back into CO2, and diffuses across the transport surfaces of the lungs due to the concentration gradient. Then the cycle starts over.
79031
It's better to breathe through your mouth.  Your mouth is bigger allowing you to get more oxygen.
465209
All gases are taken into the lungs.
19898
if you breath you only get about 20% of the total amount of oxygen out of the air. The remaining oxygen you blow onto the coal which helps it to re-ignite for a sec.
437739
You breathe it out as carbon dioxide.  You also probably lost some water weight through evaporation and urination.
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oxygen and carbon dioxide
192217
b)less,because while you exercising your lungs needs more extra oxygen,makes your body need to breath more air
92003
The respiratory system is how you breath in and out. In fact, any organism that participates in gas exchange has a respiratory system. In humans and other mammals, the respiratory system consists of the airways, the lungs, and the respiratory muscles that mediate the movement of air into and out of the body.
173398
Here's the real answer to your question:\n\nTake a deep breath in, but don't hold it, just keep the air in your lungs for about 3-5 cycles (the time it would take for you to breathe in and out 3-5 times).  \n\nA hiccup results from your brain thinking your lungs aren't getting enough oxygen, so it forces oxygen in until something turns the trigger off.  Holding your breath doesn't turn the trigger off, because the hiccupping is centered around the inhale, but holding your breath = pausing the exhale.  But if you keep your lungs in a posture of continuous inhalation, the hiccups stop immediately because the brain realizes the lungs are fully saturated.
399616
Be sure you are taking in as much air as you are expelling. Breathe in through the nose and out through the mouth. Try not to suck air in through your mouth. Tell yourself "Inhale, Exhale".