The human body includes the entire structure of a human being and comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet.
Every part of the body is composed of various types of cells, the fundamental unit of life.
At maturity, the estimated average number of cells in the body is given as 37.2 trillion. This number is stated to be of partial data and to be used as a starting point for further calculations.
The number given is arrived at by totaling the cell numbers of all the organs of the body and cell types. The composition of the human body is made up of a number of certain elements including carbon, calcium and phosphorus.
The average adult body contains between 5 and 5½ liters of blood and approximately 10 liters of interstitial fluid.
The composition of the human body can be referred to in terms of its water content, elements content, tissue types or material types.
The adult human body contains approximately 60% water, and so makes up a significant proportion of the body, both in terms of weight and volume.
Water content can vary from a high 75% in a newborn infant to a lower 45% in an obese person. (These figures are necessarily statistical averages).
Here is video of whole human body scanned, see what is inside our body:
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