The most abundant element in the human body is oxygen, accounting for about 65% of our body weight. Carbon is the second most abundant element, making up about 18% of our body weight. Hydrogen is the third most abundant element, making up about 10% of our body weight. Nitrogen is the fourth most abundant element, making up about 3% of our body weight. Calcium is the fifth most abundant element, making up about 1.5% of our body weight.
Oxygen is the most abundant element in the human body because it is a major component of water, which makes up about 60% of our body weight. Oxygen is also a major component of the proteins, carbohydrates, and fats that make up our cells.
Carbon is the second most abundant element in the human body because it is a major component of organic molecules, such as proteins, carbohydrates, and fats. Carbon is also a major component of DNA and RNA, which are
the molecules that contain our genetic information.Hydrogen is the third most abundant element in the human body because it is a major component of water and organic molecules. Hydrogen is also a major component of ATP, which is the molecule that provides energy for our cells.
Nitrogen is the fourth most abundant element in the human body because it is a major component of proteins and nucleic
acids. Nitrogen is also a major component of ammonia, which is a waste product that is excreted from our bodies.Calcium is the fifth most abundant element in the human body because it is a major component of bones and teeth. Calcium is also a major component of blood plasma and other body fluids.