Every human being carries within him a giant number. That is blood. If we examine a drop of blood under a microscope, we will see a large number of red blood cells. They are disc-like, flattened in the middle (photo no. 1). They are all roughly the same shape, 0-007 mm in diameter, and 0-002 mm thick.

red blood cells

A drop of blood as small as 1 cubic millimeter contains many, many corpuscles—500,000 of them. How many cells in the human body? The amount of blood in the body is a little less than 14 percent of the kilogram weight of a human body. Let's say, if the man weighs 40 kilograms, then his body has about 3 liters (or 3 million cubic millimeters) of blood. A very simple calculation shows that his body has 5,000,000 × 3,000,000 = 15,000,000,000,000 red blood cells.

1,500,000 billion red blood cells! If they can be tied to the fertilizer, then how big will be the yarn? That's not hard to calculate at all, 105,000 km. That is, a few pucks can be wrapped around the Earth's equator, it is so long, 100,000: 40,000 = 2.5 times. Any person of suitable weight can be considered. Then the earth can be tied 3 times with this chain of red cells.

These tiny red blood cells perform essential functions in our body. They deliver oxygen to all parts of the body. They pick up oxygen when the blood passes through the lungs, then when the bloodstream carries them to our tissues, they carry that oxygen to areas far away from the lungs.

The smaller and more numerous the particles are, the better they work. Because, then their skin volume is more and through this skin they can absorb or release oxygen. If you calculate, it will be seen that the total volume of their skin is many times more than the volume of human outer skin.

It is 40 meters long and 30 meters wide, which is about 1200 square meters. Now you understand how important it is to have as many red blood cells as possible in the living organism. They absorb oxygen through a space 1000 times larger than our body, then transport it to other parts of the body.

The total amount of food that a person eats is also a monstrous number (if life span is assumed to be 70 years on average). It would take a train to transport all the tons of water, bread, meat, animals, fish, vegetables, eggs, milk, etc. that a person consumes in his entire life.