How many cells does a person have?

We all know that there are many cells in the human body, and these cells will undergo metabolic reactions. That is, after the old cells die, they will divide and produce new cells. After the functions of the old cells weaken, they will age and need new cells to replace them. If there are no new cells, it is likely to cause low immunity in the human body. So how many cells are there in the human body?

Cells are the structural and functional units of the human body. There are approximately 400,000 to 60 trillion cells in total, and the average diameter of the cells is between 10 and 20 microns. All cells except mature red blood cells have a nucleus, which is the center for regulating cell functions. The largest is the mature egg cell, which has a diameter of more than 0.1 mm; the smallest is the platelet, which has a diameter of only about 2 microns. The lifespan of intestinal mucosal cells is 3 days, the lifespan of liver cells is 500 days, and the lifespan of nerve cells in the brain and bone marrow 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. The most amazing thing is that the nerve impulse transmission speed of the brain's nerve cells exceeds 400 kilometers per hour, which is equivalent to half the speed of a 777 aircraft.

1: There are about 32 million cells in every 2.54 cm of human skin. A large person has more than 100 billion cells in his skin, which is equivalent to 17 times the population of the earth.

2: The life span of human cells is four months, but their life journey is more than 1.6 million meters.

3: The human brain has more than 10 billion nerve cells, which can record about 86 million pieces of information in life every day. It is estimated that a person can store 10 billion pieces of information in memory in his lifetime.

4: If the brain's activity is converted into electrical energy, it is equivalent to the power of a 20-watt light bulb.

5. The throat is the busiest passage in the human body. In a lifetime, a person eats 40 tons of food through the mouth and throat and inhales about 350,000 cubic meters of air.

6: It takes about 500th of a second for the light from an object to enter the eye and for the brain to perceive the object.

7: Human eyes are very sensitive. Under ideal conditions, you can see a lit match 80 kilometers away from a mountaintop at night.

8: The average person produces half a kilogram of tears per year

9. A person’s longest dream is no more than 40 minutes

1 0: A person can only sleep for 121 consecutive hours at most.

11: Human fingers are very sensitive and can sense even a tiny vibration of one in 50 million.

12: The air inhaled by a person before coughing is 5 times the normal amount, which increases the pressure on the lungs by 20 times. The air expelled during coughing can reach a speed of 160,09 kilometers per hour.