The notion of tissue can be used in different contexts. For botany, anatomy and zoology, a tissue is a set of cells that, acting in a coordinated way, have a common purpose. Blood, in turn, is what is connected to blood (the reddish fluid that circulates through the body through veins, arteries, and capillaries).
The concept of blood tissue refers to that which is composed of a liquid matrix and different types of cells. In general, blood tissue is classified as specialized connective tissue, which is the name of those tissues that allow the integration of different organ systems and facilitate their support. For some experts, on the other hand, blood tissue is one of the primary tissues.
In blood tissue, a liquid phase (blood plasma) and a solid phase (made up of platelets, white blood cells, and red blood cells) can be differentiated. Both phases are called blood components: the liquid phase is the serum component, while the solid phase is the cellular component. Blood vessels contain blood tissue and allow it to be distributed throughout the body. Among the various functions it performs are the transport of oxygen, the supply of nutrients and the transport of cells and various substances. The circulatory system is responsible for the circulation of blood tissue throughout the body. The organ that drives circulatory activity is the heart, which pumps blood through the veins, arteries, and capillaries. White blood cells White blood cells are also called leukocytes and are one of the cellular players in our immune system. These are migratory cells that use blood to access various regions of the body. Among the main functions of white blood cells are the destruction of pathogenic microorganisms and the cells they infect and the secretion of substances such as antibodies, responsible for fighting infections. According to their normal count, white blood cells are found in the blood at a maximum of 11,500 per cubic millimeter, but this value can be as low as 4,500, and this difference is influenced by several factors that are grouped in physiological conditions (stress, pregnancy, age, physical activity, etc.) and pathological (cancer, infections, immunosuppression, etc.).
Red blood cells Also known as erythrocytes or red blood cells, red blood cells represent practically 96% of the so-called formal or figurative elements (the aforementioned red blood cells, white blood cells and platelets). It is interesting to note that the amount present in men and women is considerably different: 5,400,000 and 4,800,000 per cubic millimeter, respectively. In addition, as can be seen, it is much higher than that of white blood cells. Red blood cells do not have organelles or a nucleus, and much of their cytoplasm is made up of certain enzymes and a protein called hemoglobin, which is responsible for transporting oxygen. Carbon dioxide is also transported in the blood tissue in three forms: bicarbonate, which serves to regulate the pH (its normal value in the arteries is usually between 7.36 and 7.44); carbodynamic compounds, by 27%; free dissolved, 8%. On the other hand, there are the glycoproteins, located in the plasma membrane, thanks to which it is possible to define blood groups. An important blood protein is hemoglobin, which is found only in red blood cells. It is the pigment responsible for the red color, so characteristic, and that also collaborates in the transport of carbon dioxide. Their normal levels exceed 18 g/dl of blood tissue and they live for approximately four months, to be eliminated and extracted.
