The human body contains many arteries, veins and capillaries, which reach all parts of the body of each other, they extend from the top of his head and even the soles of his feet, all called blood vessels, because they form the only bloodstream throughout the body. The blood is a fluid of a red-colored color, pumped by the heart by constriction and its expansion in the blood vessels, and the blood form about 8% of the mass of the human body.
The importance of blood
Blood is the fluid of life, and man can not live without it. Every drop of it transmits life to many cells. Blood plays a vital role in the completion of vital processes within the body. It performs important functions to keep the body alive. The body as:
- Very important for the breathing process; it works to transport oxygen from the lungs to all tissues of the body in the process of inhalation, as well as works to transfer the carbon dioxide generated by the process of cellular respiration to the lungs, to be removed from the body in the process called exhalation.
- Is very important in the process of taking advantage of food within the body; it is working to take the nutrients that the intestines absorb them to connect to the rest of the body cells, to burn them and form the energy necessary for the body.
- Plays a large role in the removal of waste from the body, as it works to take the waste resulting from the metabolism of cells to be transferred to the devices of output.
- Blood is a way to defend the body against foreign diseases and objects that enter it through the presence of white blood cells in it, which is to infect all foreign objects that may enter the body, except that blood itself is making antibodies to protect the body, blood is an important means to maintain On body immunity.
- Blood is a way to maintain the water balance inside the body, so that it moves the excess fluid from the body’s need to the output devices, the body gets rid of them through urine and sweat.
- The blood absorbs heat from the internal organs as it moves from it. It also works to get rid of excess heat through radiation, pregnancy and evaporation; it is a way to keep the body temperature regulated.
- Blood acts as an important means of transporting hormones secreted from the glands to complete vital processes within the body to the fullest.
Because of the importance of blood is very severe for the human being, it must exist within the body within certain levels, if the percentage of the person has anemia, but if it exceeds these levels, it will be human to go every period to the bank blood to withdraw the amount of excess blood, and It is worth mentioning that this blood is corrupt and can not be used, and the normal blood levels within the body are as follows:
- For men: 13.5 to 17.5 g / dL.
- For women: 12.1 to 15.1 g / dL.
- For children: 11 to 16 g / dL.
- For pregnant women: 11 to 12 g / dL.