What is a Cell?

Human cells are the basic unit of the structure and physiological functions of the human body. There are about 40 trillion to 60 trillion human cells, and the average diameter of cells is between 10 and 200 microns. Except mature red blood cells and platelets, all cells have at least one nucleus, which is the control center that regulates cell life activities, controls division, differentiation, inheritance, and mutation.

Human body

The most basic unit of most species is a cell, and the human body is also made up of cells. So how many cells are there in the body? According to a rough estimate by scientists, it is about 40-60 trillion.

Among the known numbers of human cells, it has been possible to accurately detect that an adult man's 1 liter of blood contains about 4.0 × 10 12th power / L red blood cells. Generally speaking, blood accounts for about 1/13 of the body's weight. For example, a man weighing 65 kg has about 5 liters of blood in his body. Based on this calculation, this man should have 2 trillion red blood cells.

The number of white blood cells in the blood is only one eighth of that of red blood cells.

The "command" of the human body, the number of brain cells, is estimated to be in the tens of billions.

In short, the number of human cells is really scary. So many cells are actually developed from the same cell. This initial cell is called a fertilized egg. Fertilized eggs grow up slowly; one becomes two, two becomes four, and four becomes eight, so it multiplies and multiplies, and finally becomes a collection of 50 trillion. origin