THE Human Body can be defined as the material structure of the human being, a highly complex organism formed by more than 30 trillion cells i.e, 30,000,000,000,000 .
This amount is, of course, a rough estimate, as it is extremely difficult to count the cells in a human body.
Estimation of the number of cells in the human body
There are approximately 200 different types of cells in the human body, e.g. erythrocytes, adipocytes, neurons, etc. Each of them is specialized in specific functions and therefore has organelles different and their structure and size are different.
For example, neurons are very long cells capable of efficiently transmitting nerve impulses. Cardiomyocytes have a lot more mitochondria because they constantly need energy. And so we could examine the 200 cell types and describe their peculiarities.
With all this, estimating how many cells there are in the human body is not as easy as measuring the weight or size of a cell and estimating the total number of cells based on the total volume of the body, but it is much more complicated.
Furthermore, cells are constantly dying and being replaced by new cells, and the number of cells differs from one person to another based on age, weight, health, environmental factors, etc.
One of the most recent techniques used to estimate the number of cells in the human body is to estimate the number of cells of each type from the density and volume of each organ.
With these data, it is estimated that a man between 20 and 30 years old, weighing 70 kg and 1.70 m tall, would have approximately 30 billion cells in your body .
What is the most abundant cell in the human body?
The 30 trillion cells in the human body are not evenly distributed in different tissues and organs. In the brain, for example, it is estimated that there are about 171 billion cells, of which 86 billion would be neurons.
But of all the cells, the most abundant are erythrocytes or red blood cells . It’s not just the blood cells most numerous, but also the most numerous throughout the body.
The erythrocytes alone represent 80% of all human cells . In numbers, a person has an average of 25 trillion red blood cells circulating in your blood, along with 147 million platelets and 45 million lymphocytes.
Each erythrocyte has a half-life of 120 days. After this period, they are removed from circulation in the spleen and liver. At the same time, new red blood cells are formed in the bone marrow. Average, 2 to 3 million new red blood cells are formed every second .
There are more bacteria than your own cells
While the number of cells in the human body may seem surprising, the number of bacteria that live in our bodies, especially in the gut, is even more surprising.
It is estimated that the intestinal microbiota reaches 38 billion individuals and another 1 billion microorganisms live on our skin and external mucous membranes.