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Download Lecture 14: Alternative Pathways in Cell respiration
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Transcript
Alternative Pathways in cell respiration Cell Respiration is separated into 3 stages KREBS CYCLE GLYCOLYSIS NADH Pyruvate NADH Glucose ATP NADH FADH2 Krebs Cycle CO2 ELECTRON TRANSPORT AND OXIDATIVE PHOSPHORYLATION ATP CO2 Electron transport chain... H 2O ATP Energy/electrons are transferred from glucose to convert NAD+ to NADH, which is used in the ETC to make ATP I eat more than just glucose, what happens to all that stuff? Vs. The metabolism of all macromolecules is tied to cellular respiration • Carbohydrates, fats, and proteins can be broken down and used in glycolysis and the Kreb’s cycle. Fats Fatty acids Krebs cycle Glycerol Carbs Sugars Proteins Amino acids Glucose NH3 Pyruvate Acetyl CoA Cellular respiration is carefully regulated: when ATP is abundant, respiration slows down when ATP is needed, respiration speeds up The metabolism of all macromolecules is tied to cellular respiration • Excess intermediates of glycolysis and the Kreb’s cycle can be converted to stored carbohydrates, fats and proteins. Pathway for synthesis of RNA, DNA Fats Glycogen or starch Glucose Phospholipids Fatty acids Pruvate Acetyl CoA Lactate (from fermentation) Krebs cycle Several intermediaries used as substrates in amino acid synthesis I eat only fat-free foodsWhy am I still getting fat?
