來自 其他
磅數 967.5磅
發文 389
註冊 2003/10/15
量級 重量級
★★★★
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這個我也滿有興趣的,所以找了些資料
http://courses.che.umn.edu/03fscn1112-1s/study_outline_for_metabolism.htm
Carbohydrate Catabolism: Glycolysis and Citric Acid Cycle
Anaerobic glycolysis, one type of glycolysis, occurs when we just cannot give the cells O2 fast enough to support respiration. The end point is lactic acid, an acid that is believed to cause muscle stiffness. Using our highways analogy, lactic acid is a roadblock. The highways stops at that point. Aerobic glycolysis, the other type of glycogen or glucose degradation, continues on to the citric acid cycle, a scheme that totally degrades glucose to CO2 and H2O. It also, as you will suspect, produces much more energy than anaerobic glycolysis.
Fat catabolism (degradation), or lipolysis, is a pathway or highway that leads to the breaking down of fatty acids by a process that is called beta-oxidation. This process leads directly into the same highway as aerobic glycolysis does and, therefore, fatty acids are completely degraded to CO2 and H2O by this process. Perhaps now you can begin to understand why fats give us 9 kcal./g of energy. Fat has more hydrogens and fewer oxygens in their structure than carbohydrates and are burned completely in the citric acid cycle. Therefore, fats contain more hydrogens (and less oxygens) to shuttle through the ETS (see below) to produce more ATP
脂肪酸由脂肪細胞釋放入血,代謝後變成水和二氧化碳,二氧化碳由肺呼山,水由小便排走,脂肪細胞就縮小了,當有多餘能量,脂肪細胞又再脹大,而脂肪細胞被認為是出生初期的食量所決定的,所以小孩時是胖的,長大了想減脂很困難,因為脂肪細胞比其他人多.
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