respiration

• what is cellular respiration?

  to release the energy of photosynthesis
• is cellular respiration exothermic or endothermic reaction and why?

  an exothermic reaction which transfers energy from glucose and continously occuring in living cells = breaking apart glucose molecules
• 3 examples of how organisms use their energy:

  • muscular contractions= enables movement
  • maintaining body temp= stay warm in cold weathers
  • build larger molecules from smaller ones combining amino acids to form proteins
• what is metabolism?

  as all the chemical process that occur within a living organism in order to maintain life
• define aerobic respiration?


  with oxygen that is supposedly the most efficient way to transfer energy from glucose
• does aerobic take place continously or discontinously?

  continously in both plants and animals
• where does aerobic respiration specifically take place?


  in mitochondria
• word equation for aerobic respiration glucose + oxygen -> carbon dioxide + water
• balanced symbol equation for aerobic respiration C6H12O6 + 6O2 -> 6CO2 + 6H20
• what is anaerobic respiration?


  without oxygen
• when do you use anaerobic respiration?


  when can't get enough oxygen to keep up with aerobic respiration
• word equation for anaerobic?

  glucose -> lactic acid
• balanced symbol equation for anerobic for animals

  C6H12O6 -> 2C3H6O3
• why isn't it good to use anaerobic respiration?

  1. incomplete breakdown of glucose molecules (no oxygen to oxidise) = inefficient= not using all energy
  2. lactic acid build up- has to be removed
• word equation for anaerobic respiration in plants and yeast

  glucose-> ethanol + carbon dioxide = fermentation = yeast
• why is anaerobic used plants and yeast

  1. add yeast to bread to make the dough rise due to the carbon dioxide it produces
  2. ethanol= type of alcohol used to make beer and wine
• which process in plants produces the glucose required for respiration?

  photosynthesis
• what are the 2 reasons animal cells prefer aerobic respiration to anaerobic respiration?

  1. Anaerobic respiration doesn't break down the glucose molecule completely, and so releases less energy than aerobic respiration
  2. Anaerobic respiration produces lactic acid which can damage cells and leads to an oxygen debt