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If we want to know in depth the term blood we have to start from what is its etymological origin. In this sense, it must be established that it comes from Latin and specifically from the word sanguis which can be defined as "soft". And it is that this meaning comes to express the texture that blood has when touched.

To blood , the fluid that our species has inside veins and arteries, is described as a reddish hue liquid present in the organism of humans and other animals. When analyzing it it is possible to verify that a part of it remains in a liquid state (identified by the name of plasma ) and by cells in suspension, among which platelets, leukocytes and red blood cells appear.

The main function of the blood is to ensure that the oxygen and the nutrients are distributed among the cells of each organism, although it is also responsible for collecting the waste elements that arise from these same cells.

The blood constitutes about 7% of the weight of the human body structure. An adult man has, on average, about five liters of blood volume. Of those five liters, almost three correspond to blood plasma.

Blood cells are grouped under the name of form elements and can be divided into the categories of blood cells (the white blood cells , also known as leukocytes ) and cell derivatives (the Red blood cells or erythrocytes , and the platelets ).

It should be noted that there are four types of blood: Group A , B Group , AB group and Group 0 . It should be noted that, if a person has a certain blood group and is transfused with blood of another type, he will get sick and may even die.

In this sense, it is very important to publicize the existence of the so-called blood banks that are those centers that are responsible for conserving the blood that, voluntarily and selflessly, donate citizens to help all those people who at some time require receiving a transfusion to continue living.

Of course, not everyone can donate blood. It is important that those who wish to do so comply with a series of basic requirements such as enjoying good health, being between 18 and 65 years of age, and having a minimum weight of approximately 50 kilos.

With regard to what are the diseases of the blood, which are studied by Hematology, there are those that affect cells, bone marrow, plasma elements or spleen and lymph nodes. Among all of them, one of the best known is called leukemia.

Unfortunately, it is characterized by being one of the types of cancer that most affects the child population and is defined as being marked by the increase in leukocytes.

The notion of blood is also used to refer to the relationship or lineage . For example: "You can't hate your brother: he has your same blood", “I am doing very well in this country, but I want to return to my homeland since the blood calls me and I miss my family”.

The idea of ​​blood, on the other hand, may appear associated with character or humor of a subject : “I get bad blood for economic problems”, "Let's see if you react at once, it seems you have no blood".

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