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The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
  • a)
    carbon
  • b)
    hydrogen
  • c)
    oxygen
  • d)
    nitrogen
Correct answer is option 'C'. Can you explain this answer?
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The human body is made up of several chemical elements; the element pr...
Element Present in the Highest Proportion in the Human Body


The human body is composed of various chemical elements that play crucial roles in its structure and function. These elements are essential for normal physiological processes and are required for the maintenance of health. Among these elements, oxygen is present in the highest proportion in the human body.


  • Oxygen (O) - 65%: Oxygen is a vital element for sustaining life as it is involved in cellular respiration, which is the process by which cells produce energy. It plays a crucial role in the breakdown of glucose and other nutrients to release energy in the form of adenosine triphosphate (ATP). Oxygen is also necessary for the oxidation of fatty acids and amino acids, which are essential components of various cellular processes.



  • Carbon (C) - 18%: Carbon is the second most abundant element in the human body. It is the fundamental building block of organic molecules, including carbohydrates, lipids, proteins, and nucleic acids. Carbon atoms form the backbone of these biomolecules and contribute to their structural and functional diversity. Additionally, carbon is involved in various metabolic pathways, such as the Krebs cycle and photosynthesis.



  • Hydrogen (H) - 10%: Hydrogen is the third most abundant element in the human body. It is present in water molecules (H2O) and is an essential component of all organic molecules. Hydrogen atoms participate in covalent bonding with carbon, oxygen, and nitrogen to form stable compounds. Moreover, hydrogen ions (protons) play a critical role in maintaining the pH balance and electrical neutrality within cells.



  • Nitrogen (N) - 3%: Nitrogen is the fourth most abundant element in the human body. It is a crucial component of proteins, nucleic acids (DNA and RNA), and many other biomolecules. Nitrogen is required for the synthesis of amino acids, which are the building blocks of proteins. It is also essential for the formation of nucleotides, which form the basis of DNA and RNA.


    • In conclusion, while all four elements (carbon, hydrogen, oxygen, and nitrogen) are essential for the human body, oxygen is present in the highest proportion (65%). This reflects its critical role in energy production and cellular respiration, making it indispensable for sustaining life.
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    The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body isa)carbonb)hydrogenc)oxygend)nitrogenCorrect answer is option 'C'. Can you explain this answer?
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