How many cells does a human body have at birth?

Many people feel that their lives are magical, especially pregnant mothers. Watching the baby grow gradually around them is a magical process. However, not many people know how many cells our human body has after birth and how many cells it has after adulthood. We only know some simple structures. In fact, a baby after birth has 2*10 to the power of 12 cells, which is a huge number. This article also introduces issues about adult cell count, let’s take a look.

1. How many cells does a human body have at birth?

A newborn baby is made up of 2*10 to the power of 12.

2. How many cells do adults have?

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

3. Cell lifespan

The lifespan of cells varies. Some brain cells can be as long as a human. The lifespan of red blood cells in human blood is only about 120 days. The lifespan of granulocytes, also a type of white blood cell in the blood, is less than 1 day. The lifespan of intestinal mucosal cells is 3 days, liver cells have a lifespan of 150 days, taste bud cells have a lifespan of 10 days, nail cells have a lifespan of 6 to 10 months, and the lifespan of nerve cells in the brain, bone marrow, and eyes is several decades, almost the same as the human lifespan. Some white blood cells in the blood can only live for a few hours. Throughout the human body, 100 million cells die every minute.

4. How many cells are there in the human brain? How many cells are there in the human body?

According to data provided by neurophysiologists, humans have more than 100 billion brain cells at birth, and this number is at its highest at birth and will not increase again throughout life. Human cells are the basic units of the body's structure and physiological functions. There are approximately 40 trillion to 60 trillion cells in the human body, and the average diameter of a cell is between 10 and 20 microns.