Aerobic respiration takes place in the presence of oxygen, produces a large amount of energy. Carbon dioxide and water are produced as the waste products. lactic acid fermentation takes place without the use of oxygen and produces small amounts of energy. in muscle tissue, what is the reactant of lactic acid fermentation and the product that builds up during intense exercise a. glucose and other compounds
b. glucose and lactic acid
c. oxygen and lactic acid
d. carbon dioxide and water

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Very hard to understand

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.