Bioenergetics

• Photosynthesis uses energy to change Carbon Dioxide and water into Glucose and Oxygen
• Photosynthesis takes place in the chloroplasts in green plant cells, they contain pigments like Chlorophyll that absorb light - energy is transferred to the chloroplasts by light
• Photosynthesis is endothermic - energy is transferred from the environment
• Carbon Dioxide + Water -> Glucose + Oxygen
• limiting factors are things that affect the rate of photosynthesis
• limiting factors are -

  • light intensity
  • temperature
  • CO2 concentration
• Respiration is the process of transferring energy from the breakdown of glucose, it goes on in every cell in the body continuously
• respiration is exothermic - it transfers energy to the surroundings
• glucose + oxygen -> carbon dioxide + water
• Metabolism is all the chemical reactions in an organism
• Aerobic respiration requires oxygen and is the most efficient method of transferring energy from glucose
• Anaerobic respiration is used if there is not enough oxygen
• Anaerobic respiration -

  glucose -> lactic acid
• Anaerobic respiration in yeast and plants -

  glucose -> ethanol + carbon dioxide
• Anaerobic respiration in yeast cells is called fermentation
• Oxygen debt is the extra amount of oxygen your body needs to react with the build up of lactic acid and remove it from the cells