SANG

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Through its multiple nourishing and protective functions, blood plays a vital role in the lives of our fabrics. Due to the complexity of its composition, it can undoubtedly be considered a real liquid cloth whose a cell here:

It is composed of a liquid: The PLASMA; cellular elements: RED BLOOD CELLS or red blood cells or erythrocytes, leukocytes or of WHITE BLOOD CELLS, the PAD or thrombocytes, and dissolved substances. Water makes up half of the composition of blood and red blood cells account for nearly all of the other half, see the diagram:

Hemoglobin (red color = protein) is responsible for the transport of oxygen (O2) to the cells, and carbon dioxide (CO2), cells to the lungs. Erythrocytes have no nucleus therefore can not reproduce, their life is limited to about four months. The leukocytes, from the red bone marrow are responsible for defense forces of the body, while Platelets play an important role in blood clotting.

The blood is the vehicle of nutrients: gas, antibodies, and a purifying function. He brings residues catabolism, where they must be removed. It also conveys the HEAT, because where it flows the blood creates a pleasant feeling of warmth.

The body produces new blood cells constantly to replace those who die. RBCs, platelets and a portion of leukocytes, are derived from the same type of cell in the bone marrow, they differ in several phases. This cell is called the HÉMOCYTOBLASTE.

For example, here is the transformation of the cell before it becomes a red blood cell, from the cell of hémocytoblaste:

In a similar manner, starting from the same basic airframe, here's metamorphosis followed by:

The volume of blood in a man is 5 to 6 liters, for women it is between 4 and 5 liters.

Blood takes between 4 and 8 seconds to move into the lungs makes it by against, 25 to 30 seconds to circulate in the whole body! Its entire journey through the arteries, veins, and capillaries, is at least ten kilometers.

In the early twentieth century that the American physician, born in Austria, Karl Landsteiner (1868-1943), discovered the principle of blood groups. It is thanks to him that we can establish the compatibility or incompatibility between the blood donor and recipient:

GROUP O: Red blood cells carry no agglutinogen, so they can theoretically be given to everyone. This group is the UNIVERSAL DONOR.

AB GROUP: red blood cells carry two types of agglutinogens. They can not be administered to individuals of the same group. However these people will be able, in theory, receive any cells. This group is the UNIVERSAL RECEIVERS.

GROUPS RH (Rh): They are defined by the presence (+) or absence (-) of the red blood cells of particular antigens, the most active is agglutinogen D. Transmission of Rhesus factors is genetics. A mother with Rh (-) may very well be pregnant with a fetus Rh (+).