Question: List the major functions of proteins in the body.

Proteins constitute about 15% of our bodies, and they perform many functions in the human body.
  • Provide structural integrity and strength for many types of tissue (muscle, hair, and cartilage)


  • Can act as Biological Catalysts. (Enzymes)
    • Increase the rate of biological reactions, which would otherwise be so slow that life would not be possible.
  • Act as a Source of Energy
  • Transport of oxygen (by hemoglobin)

  • protein.gif

Important Note: If you get this question on the IB exam you only need to list "structure, biological catalysts (enzymes), and energy sources" and you will get the mark.