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+* Cellular Respiration
+respiration (system) \neq cellular respiration
+
+circulatory system delivers glucose and O_2 picks up CO_2
+
+C_6 H_{12} O_6 + 6O_2 \Rightarrow_{\text{cellular respiration}} 6CO_2 + 6H_2 O + \text{ATP}
+
+** Steps:
+1. Glycolysis
+2. Kreb's cycle (TCA crycle, citric acid cycle)
+3. electron transport chain (coupled with oxidative phosphorylation)
+
+** Aerobic Cell Respiration
+*** Glycolysis:
+Conversion of glucose \rightarrow 2 (3C) molecurles (pyruvate)
+2 net ATP produced
+Occurs in cytoplasm
+Occurs without O_2
+NADH (caches 2 electrons) loaded with high energy electrons
+
+*** Kreb's Cycle
+Occurs in mitochondrion
+O_2 required
+2 ATP are produced
+Carbon completely oxidized to CO_2
+NADH and FADH_2 are loaded with high energy electrons
+
+*** Electron transport chain:
+Occurs in mitochondria
+O_2 is required
+NADH and FADH_2 unload high energy electron cargo
+Big ATP payoff (around 25 ATP produced)
+
+** Anaerobic Fermentation
+Both aerobic and anaerobic do glycoloysis
+
+** Creatine Phosphate
+Another source of ATP production