CIE IGCSE Biology

Revision Notes

12.1 Respiration Basics

Uses of Energy in the Body

  • Respiration is a chemical process that involves the breakdown of nutrient molecules (specifically glucose) in order to release the energy stored within the bonds of these molecules
  • Respiration can take place with oxygen (aerobically) or without oxygen (anaerobically). Much less energy is released for each glucose molecule broken down anaerobically compared to the energy released when it is broken down aerobically
  • Respiration occurs in all living cells. Most of the chemical reactions in aerobic respiration take place in the mitochondria

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

  • Humans need this energy to do the following things:
    • Contract muscle
    • Synthesise proteins
    • Cell division (to make new cells)
    • Grow
    • Enable active transport to take place
    • Allow nerve impulses to be generated
    • Maintain a constant internal body temperature

How is Respiration Controlled?

  • Respiration is a series of reactions that are controlled by enzymes. You need to be able to state this in an exam!

Author: Jenna

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.
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