Why does blood coagulate? Detailed answer

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Why does blood coagulate? Detailed answer

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Why does blood coagulate?

We can't lose blood. Although a healthy person without a threat to life can lose up to one third of the blood, nevertheless, continuous loss of blood or loss of blood when we are sick can be very dangerous. Nature has protected us from this danger by giving the blood the ability to clot. If coagulation occurred in the circulatory system, it would be no less dangerous.

Blood does not coagulate (or clot) when it comes into contact with the smooth walls of blood vessels. Indeed, if blood is poured into a smooth-walled or lubricated glass vessel, it will not clot!

If you dip a glass rod into the blood, it will not clot either; but if you put a wooden stick in there, the curdling will start! Therefore, it can be considered that a rough surface or damage to the blood vessels is required to start the blood clotting process.

The first thing that happens is the appearance of very thin threads of a substance called fibrin in the blood. These threads form something like a net and entangle the blood cells, much like a cobweb entangles a fly. At this point, the flow of blood stops, and an accumulation of blood cells forms here. These fibrin strands are very strong and very elastic and can hold blood cells in a clot.

A blood clot resembles absorbent cotton, which nature has created to protect us from blood loss. Everyone's blood clots at a different rate. There are even people whose blood clots very slowly, if not at all. This condition is called hemophilia. It is a very curious disease in terms of mode of transmission.

Hemophilia only affects men, but is never transmitted directly from father to son. It is passed from father to daughter, who remains healthy but passes the disease on to his son. Thus, this illness is inherited by the grandson of the sick grandfather!

The most famous example of this disease was perhaps Queen Victoria of Great Britain. Both she and her husband inherited hemophilia from their ancestors. As a result, six of their grandchildren suffered from this disease, and among them were the Crown Prince of Spain and the son of the last Russian Tsar!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What are the rules in women's football?

Almost the same as men, although there are some differences in the rules of football for women and men. They play two halves of 30 minutes each with a reduced and lightweight ball with a circumference of 62-66 cm and a mass of 340-390 grams. Football players' shoes must not have any spikes. It is forbidden to attack the goalkeeper within the goalkeeper's area from the ball hitting the body, you can defend yourself with your hand.

All rules of women's football are international.

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No dark matter found around the sun 26.04.2012

A group of Chilean astronomers working at the La Silla Observatory, part of the European Southern Observatory, did not detect the expected dark matter in a large "piece" of galactic space around the Sun.

The main goal of the Chilean research was precisely the search for dark matter. As previously thought, it is everywhere, concentrated in the centers of galaxies, and even, perhaps, in some special intergalactic cavities. The Sun is almost the outermost star of the Milky Way. Thus, if the total mass of dark matter is 80% of the entire mass of the Universe, then in our galactic "outback" for each volume of space equal to the volume of the Earth, there should be at least 400 grams of matter.

Using the telescopes of the La Silla Observatory, astronomers examined 400 giant stars located at a distance of up to 13 light-years from the Sun. Scientists with record accuracy determined the characteristics of their movement and, on this basis, calculated the mass of the indicated sphere. And they were amazed to find that this mass coincides with the mass of stars, gas and dust that are there. There was simply no place for dark matter in our microdistrict of the Galaxy. Strictly speaking, the measurement error in the experiment made it possible to detect dark matter if its mass in space with the volume of the Earth exceeded 70 grams. This did not happen.

"Calculations show that dark matter must have manifested itself in our measurements," says Christian Moni Bidin of the Astronomy Department of the Chilean Research University, "but it's not there!"

If this discovery is confirmed, then scientists will have to look for another solution to the "missing mass" problem, since all the facts indicate that there is still some kind of invisible gravitational influence. Galaxies, including the Milky Way, spin faster than they should, there are many other inconsistencies that only the presence of dark matter could explain so far.

Christian Moni Bidin is very hopeful that the European Space Agency's future orbital observatory, called Gaia, will shed light on this dark mystery. It is planned that this optical telescope will start operating in 2013. He will draw up a detailed map of the Milky Way and indicate the coordinates of more than a billion stars.

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