Children know how to respond with their arms, legs, stomach and head, and that their eyes, ears, nose, mouth and hair are placed on the head. Adolescents and adults know that there’s a brain in the human head, which is divided into two hemispheres, and that there’s also the cerebellum (little brain) and nerves; that each person has teeth in its mouth, which are protected by the tooth enamel, and that inside them, there’s a tooth nerve. But, have you ever wondered what are we made up of? How far can we go into analyzing the human body?

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What Is The Human Body Made Up Of?

Nearly 99 percent of the human body is made up of oxygen, hydrogen, carbon, calcium, phosphorus and nitrogen. These are six elements in total, making the most of our bodies. 5 other elements, sulfur, potassium, magnesium, chlorine and sodium, make only 0.85 percent.

Thus, we are left with 0.15 percent, made of gallium, thallium, yttrium, niobium and fifteen other elements. However, we still don’t know what is the role of these elements. Some even argue that they don’t perform any function at all. Among these “useless” elements, we can also find gold, which makes 0.000014 percent of the human body, and silver with 0.000001 percent. Also, there are toxic elements in our bodies, such as lithium and arsenic. But, they are in bound form, in compounds, which have more features and are not dangerous.

In addition, in this small percentage, there are also elements that are essential for life. One of them is iron. Even though it occupies only 0.006 percent of the human body, it’s extremely important for the formation of hemoglobin. Cobalt has even less, 0.0000012 percent. But, it’s very important for vitamin B12.

All these chemical elements build molecules, which is how we get to the already known elements of the human organism, such as water, fat or lipids, proteins, DNA, RNA and other compounds, organic and inorganic.


Body water accounts for the highest percentage in the human body, followed by proteins and lipids. Water is an essential element, supporting the incorporation and absorption of all the nutrients and oxygen in the cells; regulating the body temperature; and participating in the process of converting food into energy. In each human cell, water occupies from 65 to 90 percent of the total mass. It’s mostly concentrated in the muscles, brain, liver, lungs, spleen, kidneys, pancreas and digestive canal, with over 70 percent made up of H2O.

Composition of the human body