Respiration

• Respiration in cells can take place aerobically (using oxygen) or anaerobically (without oxygen).
• Aerobic respiration is an exothermic reaction that can be represented by word and symbol equations
• The equation for cellular respiration is glucose + oxygen → carbon dioxide + water.
• An exothermic reaction is one that transfers energy to its surroundings
• Organisms need energy for: • chemical reactions to build larger molecules • movement • keeping warm.
• Anaerobic respiration in muscles is also exothermic but it gives out less energy. glucose- lactic acid
• Because the oxidation of glucose is incomplete in anaerobic respiration much less energy is given out than in aerobic respiration
• If insufficient oxygen is supplied, anaerobic respiration takes place in muscles. The incomplete oxidation of glucose causes a build up of lactic acid and creates an oxygen debt
• Oxygen debt is the amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from the cells