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Home > Anatomy & Physiology > Cellular Respiration

Cellular Respiration

 

What is Respiration?

Cellular Respiration is the process that takes place in cells to convert food into energy. This process is also known as internal respiration. In order to release the maximal amount of energy, the molecules of Carbon, Hydrogen, Oxygen and Nitrogen which make up our food are stored as a high energy molecule known as ATP or Adenosine Triphosphate.

The Products of Respiration

When energy is needed, ATP is broken down using an enzyme (known as ATPase) into ADP (Adenosine Diphosphate). This process breaks the high energy Phosphate (P) bond and so provides energy for use by the body. Here is the equation you may see in text books:

ATP = ADP + P +Energy

The human body is also capable of resynthesising ATP to allow it to continue producing energy. To do this it must use energy to reverse the equation shown above. This is known as an endothermic reaction as it requires energy. The breakdown of ATP is called exothermic as it produces energy. The process of breaking down and resynthesising ATP is efficient at producing energy as less energy is required to resynthesis the ATP than is made to break it down. Here is the Resynthesis equation:

Energy + ADP +P = ATP

What are the Energy Systems?

There are two energy systems used in during the process of respiration. Aerobic Respiration, meaning 'with oxygen' which is used for long-term, steady paced exercise and day-to-day activities and Anaerobic Respiration or 'without oxygen' which produces fast bursts of energy for short, powerful bursts. The Anaerobic system can be divided into two further systems, ATP-PC and Lactic acid. All energy systems work together, but the intensity and type of activity will determine which system is predominant.

Now Test Yourself

1. Complete this equation: ATP = ___ + P + _____











Flip card >

1. Complete this equation: ATP = ___ + P + _____



  • ATP = ADP + P + energy






Next Card >

2. Name the two types of anaerobic energy system










Flip Card >

2. Name the two types of anaerobic energy system



  • ATP-PC system
  • Lactic acid system





Next card >

3. What is glycolysis?











Flip Card >

3. What is glycolysis?



  • The breakdown of Carbohydrate (in the form of glucose or glycogen) into pyruvic acid. This produces 2 molecules of ATP





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4. Which section of the aerobic system produces most ATP?










Flip Card >

4. Which section of the aerobic system produces most ATP?



  • Electron transport chain






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5. Which energy system would be predominant in a 200m race?










Flip Card >

5. Which energy system would be predominant in a 200m race?




  • Lactic acid system




Start again with first card >

 

Next - Aerobic Respiration >>

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