C astlehead H igh S chool Anaerobic Respiration Breaking down glucose in the absence of oxygen

C astlehead H igh S chool Anaerobic Respiration in animal cells The breakdown of glucose in cells in the absence of oxygen During vigorous exercise when not enough oxygen to meet demands. Glucose is only partly broken down and only 2 ATP molecules are made

C astlehead H igh S chool Anaerobic respiration in animal cells Starts with glycolysis Glucose Pyruvic Acid 2ADP + 2Pi 2ATP Lactic Acid reversible

C astlehead H igh S chool Effect of Lactic Acid Formed when not enough oxygen present for aerobic respiration Makes muscles sore – muscle fatigue When exercise stops breathing takes in oxygen and the lactic acid is converted back to pyruvic acid This is called the oxygen debt – the volume of oxygen required to convert lactic acid back to pyruvic acid

C astlehead H igh S chool Anaerobic Respiration in plant and yeast cells Again glucose partially broken down in absence of oxygen Can occur when root cells growing in muddy soil or when yeast is used in brewing and bread making Again only 2 ATP molecules are made

C astlehead H igh S chool Anaerobic Respiration in plant and yeast cells Glycolysis takes place first Glucose Pyruvic Acid 2ADP + 2Pi 2ATP Ethanol and Carbon Dioxide NOT REVERSIBLE

C astlehead H igh S chool Experiment Demonstrating anaerobic respiration in yeast Lime water to test for presence of carbon dioxide Glucose boiled to remove oxygen Layer of oil to prevent oxygen getting in

C astlehead H igh S chool Experiment Results Increase in temperature noted as yeast cells respire and release energy Lime water turns cloudy showing the presence of carbon dioxide Alcohol smell given off