Multiple choice

Which of the following elements is present in the highest percentage in the body of man?

  1. Oxygen

  2. Carbon

  3. Nitrogen

  4. Sulphur
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon is the most abundant element in the human body by mass, making up approximately 18% of total body weight. This is because carbon is the fundamental building block of all organic molecules - proteins (16% of body mass), fats, carbohydrates, and nucleic acids all contain carbon atoms in their backbone structures. While oxygen is the most abundant by number of atoms (65%), carbon-containing molecules have higher atomic mass.

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