12 Glycolysis You must put energy in to get energy out! Glucose is broken down in the cytoplasm through the anaerobic process of glycolysis.
13 GlycolysisGlycolysis has a net result of two ATP, two NADH and two pyruvate.Most of the energy from the glucose is still contained in the pyruvate.
14 Glycolysis Review Where does glycolysis take place? CytoplasmWhat are the energy carrying molecules in involved in glycolysis?ATP, NADHWhat is the main molecule being broken down? What is it broken down into?Glucose pyruvate (pyruvic acid)Does glycolysis require oxygen?No. It is anaerobic.
15 In the presence of oxygen, pyruvate is transported into the mitochondrial matrix, where it is eventually converted to carbon dioxideKREB’S CYCLE
16 Krebs CycleThe series of reactions in which pyruvate is broken down into carbon dioxide is called the Krebs cycle.
17 Pyruvate reacts with CoA to from acetyl-CoA Pyruvate reacts with CoA to from acetyl-CoA. CO2 is released and NADH is formed.Acetyl CoA forms Citric AcidCitric Acid is broken down. Two CO2 molecules are released. One ATP, three NADH and one FADH2 are formed.Remember, two pyruvates are formed during glycolysis. Both go through the Kreb’s cycle. So… for every ONE glucose molecule, there are two “turns” of the Kreb’s Cycle!
24 So what happens when oxygen is not available? The cell can still undergo Glycolysis to produce ATP, but without oxygen the electron transport chain does not work, so waste builds up.
25 Anaerobic Respiration (Fermentation) Cellular EnergyAnaerobic Respiration(Fermentation)The anaerobic pathway that follows glycolysisOccurs in the cytoplasmTwo main typesLactic acid fermentationAlcohol fermentation
26 Lactic AcidAlcoholProduced by skeletal muscles when the body can’t supply enough oxygen; causes fatigue and sorenessOccurs in yeast and some bacteria
29 Still Unsure? Watch this three-part series. Part 1: Introduction and Glycolysis Part 2: The Kreb’s Cycle Part 3: Electron Transport Chain
30 JOURNALList the three parts of cellular respiration. At which stage is oxygen crucial? What type of pathway is this (aerobic or anaerobic)?
31 Comparing Photosynthesis and Cellular Respiration Photosynthesis removes carbon dioxide from the atmosphere and cellular respiration puts it back. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses that oxygen to release energy from food.
32 Comparing photosynthesis and cellular respiration
33 Quick lab, page 264How does exercise affect disposal of wastes from cellular respiration?After completing the lab, read pages in your textbook for further information.
34 journalCreate a table or diagram that demonstrates the processes of photosynthesis and cellular respiration. Try to name what type of organism each process occurs in, which organelle each process takes place in, what is needed for each process and what is a result of each process (what goes in, what comes out?)