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Our fuel

Our fuel . the oxygen is supplied by the breathing system. and the fuel (in the form of digested food) comes courtesy of the digestive system. +. 2. The bodies energy-making reaction needs similar things to the energy-making process of fire.

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Our fuel

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  1. Our fuel the oxygen is supplied by the breathing system and the fuel (in the form of digested food) comes courtesy of the digestive system. + 2 The bodies energy-making reaction needs similar things to the energy-making process of fire. Like the fire, the body needs oxygen and a fuel.

  2. Our pipelines to the cells food oxygen breathing system digestive system BLOOD If we now think back over the journey of oxygen and digested food through the human body, we will realise that they both end up in the same place. these substances eventually arrive at the body cells

  3. Every living cell needs to respire capillary blood + oxygen food muscle cell Therefore, the raw materials for the energy-making process eventually arrive at the bodycells. This energy-making process is known as... R E S P I R A T I O N Each living cell is supplied with food and oxygen in order to generate energy.

  4. What’s the waste? Before you start exhaling, the lime water is a clear liquid Blow gently through a straw into a test tube filled with lime water. After a short while, the lime water becomes cloudy. straw lime water If we study the composition of the air that is breathed out, we will identify the waste products of respiration. Two tests help us identify these waste products. Test One

  5. Identification of the first waste product carbon dioxide (CO2) If a gas is bubbles through lime water and the liquid becomes cloudy, the gas is identified as…. This is the first of our wasteproducts of respiration.

  6. Seeing your breath The air you breathe out is visible because the mystery waste product condenses back into a liquid. On a freezing cold day, watch what happens when you breathe out. water Test Two This waste product is water vapour and so our final waste product of the process of respiration is...

  7. The equation for respiration FOOD (GLUCOSE) + OXYGEN + + CARBON DIOXIDE WATER ENERGY from digestive system from breathing system waste product exhaled waste product exhaled USEFUL! Using this information, we can now write out the full equation for respiration.

  8. Equation for aerobic respiration Glucose + Oxygen Carbon Dioxide + Water + Energy So our original equation for the process of respiration is actually the equation for aerobic respiration. This is an efficient process... enough energy is made to supply the whole body. Our bodies perform aerobic respiration for much of the day. In fact, as long as the supply of oxygen remains high enough, we will continue to perform aerobic respiration. Of course, the amount of energy we produce will drop if the level of oxygen drops.

  9. When this supply is cut off, the cell is left with excess food and lacks energy. blood cell Oxygen shortage at the cellular level With aerobic respiration, the cells supply of oxygen and food is relatively constant. oxygen food It solves this problem by making energy from just the food alone!

  10. Anaerobic respiration Now because it is releasing energy from food, it is still performing respiration. But it is not aerobic respiration because there is no oxygen present. (aero- means of air) Therefore we call it ANAEROBIC respiration. The energy being made by breaking down the food without oxygen. This seems a better process! To be able to make energy without needing oxygen would be very beneficial. However, there is a problem.

  11. The anaerobic equation Glucose Lactic Acid + (some) Energy not as much energy as with aerobic respiration waste product from the digestive system This waste product is known as LACTIC ACID. Therefore the equation for anaerobic respiration is… You will notice that this reaction is only an option for short periods of time. This is because the waste product is harmful and not enough energy is made to satisfy the body.

  12. Why is lactic acid so harmful? relaxation contraction Well, this chemical can stop muscles within the body, from contracting and relaxing. The lactic acid soaks the muscle cells and prevents the muscle cell from doing its job. If the muscles in your body stop contracting and relaxing they are said to be fatigued. They eventually seize and you experience cramp.

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