Edexcel IGCSE Biology

Revision Notes

2.6.1 Energy


  • Organisms need energy for things such as:
    • Chemical reactions to build larger molecules from smaller molecules
    • Muscle contraction to allow movement
    • Keeping warm (to maintain a constant temperature suitable for enzyme activity)
  • Cellular respiration is an exothermic reaction that is continuously occurring in living cells
  • The chemical process of cellular respiration releases energy from glucose
  • The energy is transferred via the molecule Adenosine Triphosphate (ATP)
  • ATP, produced in respiration in the mitochondria, is required for living processes to occur within cells and organisms

Uses of energy in the human body, IGCSE & GCSE Chemistry revision notes

Uses of the energy released from respiration

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Ruth graduated from Sheffield University with a degree in Biology and went on to teach Science in London whilst also completing an MA in innovation in Education. With 10 years of teaching experience across the 3 key science disciplines, Ruth decided to set up a tutoring business to support students in her local area. Ruth has worked with several exam boards and loves to use her experience to produce educational materials which make the mark schemes accessible to all students.

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