One of the coenzymes that helps cellular respiration is NAD+, which contains the B Vitamin, Niacin. RIG: Reduction Is a Gain (of H + and e –) OIL: Oxidation Is a Loss (of H + and e –) Oxidation: The glucose is being oxidized into carbon dioxide. Remember, an acidic solution is one that has more hydrogen ions (H +) than hydroxide ions (OH –). We breathe in oxygen to remove the hydrogens off the sugars and fats otherwise the extra will cause the acidity to increase and proteins will unravel (denature) and die. For this reason, it is said that oxygen is a hydrogen acceptor. When you attach a couple hydrogens onto an oxygen, you get water. What living things do is they take oxygen and transfer the hydrogens that come off of sugar molecules and stick them onto oxygen. If you start to exercise, cellular respiration starts to speed up inside your muscle cells to produce more ATP, so your body starts breaking down sugars at a faster rate, you breathe oxygen at a faster rate and exhale carbon dioxide at a faster rate and give off a lot more heat at the same time. In other words, approximately 40% of the energy that’s created is used to phosphorylate ADP into ATP.įurthermore, this reaction explains why the temperature of your body is almost 100☏. This release of heat is predicted by the law of thermodynamics. It’s impossible to convert one form of energy into another without creating heat. Therefore, the complete oxidation of glucose is only about 40% efficient (288/686). The actual usable energy obtainable from the 38 ATP molecules that may be produced from this glucose is 288,800 calories (38 x 7,600 calories per ATP). Some nifty numbers here: There’s 686kcal (686,000 calories) in a mole of glucose. Only about 25% of the burned gasoline goes toward moving your car while the other 75% is given off as heat which is why your engine and exhaust systems are very, very hot. Even your car engine is only about 25% efficient at best. Nothing is perfectly efficient in this world. In actuality, this process requires several steps because the sugar is broken down by baby steps, little by little, and is catalyzed many enzymes and coenzymes. In essence, the energy that was in covalent bonds of the glucose molecule is being released. Cellular respiration also explains why we are breathing oxygen and why we exhale carbon dioxide. You need oxygen to unlock the energy that’s in the food. Even if I brought in all the food in the world and then I diabolically suck all the oxygen out of this room, you’re still going to die. If you don’t have food, you can’t make ATP and you’re going to die. In order to make ATP, you need food (sugar) and oxygen. Here is the overall simplified reaction for aerobic respiration:Ĭ 6H 12O 6 + 6O 2 -– enzymes & coenzymes -> 6CO 2 + 6H 2O + Release of Energy (≤38 ATP) + Heat Since ATP is found in all living things it’s sometimes called the energy currency of cells, which goes well with this laundromat analogy. A fat molecule is more like a $100 bill because it has that much more energy. One glucose will give you as much as 38 ATP, similar to the way a $10 bill will give you 40 quarters. They don’t run off $10 bills (sugars/fats/proteins). All the chemical reactions in living things run off of these quarters (ATP). So you might say, “I don’t have any quarters but I want to wash my clothes and I have a $10 bill.” You put your $10 bill into the change machine and you get 40 quarters and now you could use the coin operated washers and dryers. If you go to a coin operated laundromat, they all seem to run on quarters for some reason. And by laundromat, I mean your body!Ĭellular respiration is like a change machine: you’re turning sugars into ATP so it will be a usable form of energy. ATP is a high energy nucleotide which acts as an instant source of energy within the cell. Cells need to have ATP because it’s the gasoline that powers all living things. Cellular respiration is the process by which organic compounds (preferably glucose) are broken apart, releasing energy that is used to produce ATP molecules.
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