IMG_0006 - Chapter(ligy 3-31 ilil Instead the pyruvate is...

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ilil" (ligy." 3-31). Instead, the pyruvate is converred ro lactic acid. The buildup of ractic ".ia i, -ir", causes rhe burning sensarion ".,d .ru-p, ";;;;;;*ith muscle fa_ tigue when not enough oryg;"i-;ffi" ro muscle ris_ i"i Wl"i."Aq"" becomes a,railable ";;i", the tactic acid rs metabolized by aerobic pathways. Because glycolysis is the only ,t"f tfrut can occur without :y9..", glucose (and glucose aeriu"j f-rn Sfy.ogen) is rhe only fuel that can be used under unu"robi. londitions. The amounrs of .ATp are very limited, no_"rr"i*ly two molecules ofArp are produced p*;;i;f of glucose instead of the usual 3L. B necap Metabolism refers to all of a cell,s chemical pr.cesses, Metaboric pathways either create morecures and use energy (anabolism) or break them down and liberate en_ ergy (catabolism). The primary source of energy for a cell is ATP, produced within mitochondria by the comptete break- down of glucose to CO, a-nd water. ff.,. pi.ur. requrres oxy_ gen. A singre morecurJof grucose yieras atout 36 morecures of ATp. Fats and proteins can atso;" ;;.d ; produce
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