TEMA STATION
In some blood cells are present, which are classified as erythrocytes and leukocytes. Platelets are not considered real cells. Then we discuss the different types of blood cells.
Erythrocytes (RBC)
Red blood cells (corpuscles) contain hemoglobin (a substance that is able to bind to oxygen). Oxygen from the lungs to be transported by red blood cells of all tissues in tijelu.Osoba who has anemia, a condition caused by too few red blood cells in the blood may show weakness, fatigue and lack of red blood cells are breath.The blood cells are most likely to know about 4-6 million / mm3. They are also called red blood cells.
Iin the hall of red blood cells in mammals, do not leave the base more hemoglobin and biconcave shape of these cells increases the surface area and volume of cytoplasmic ratio. These properties make it more effective dissemination of oxygen, these cells .. The so-called "sickle cell anemia, red blood cells are typically sickle-shaped electron microscopy, biologists have seen the red blood cells can have different forms: normal (discocyte), berries (teeth), strawberries (echinocytes), white (codocyte), anemia, oats hull, a broad, sharp, bleeding, poikilocytes, etc. The half-life of erythrocytes is about 120 days. When you reach the end of their lives, they are retained by the spleen, where they are phagocytosed by macrophages.
There are five types of white cells in the body, including the following:
Neutrophils
Basophils
Eosinophils
Monocytes
Lymphocytes
These cells fight viruses, bacteria and others and participate in the hypersensitivity reaction seen in allergic reactions.
Neutrophils, basophils, eosinophils, and the (white blood cells that destroy bacteria). Granulocytes are characterized by small particles or granules, found in every cell, which contains substances that fight infections. Granulocytes undergo several developmental stages before becoming mature neutrophils, basophils, eosinophils O. Most of immature myeloid series of cells called granulocytes are myeloblasts, promyelocytes, myelocytes, metamyelocytes, band forms (cells with a dagger), and polymorphonuclear leukocytes (PMN).
Neutrophils are very active in the trailer and the bacteria are present in large numbers in the pus of the wound. Unfortunately, these cells are unable to renew their lysosomes used in digesting microbes and killed after consuming any of them.
Eosinophils attack parasites and phagocyte antigen-antibody complexes.
Basophils differ anticoagulant and vasodilator substances such as histamine and serotonin. Although the phagocytic capacity, its main function is to secrete substances that are involved in the hypersensitivity reaction.
Lymphocytes are cells that, in addition to being present in the blood, fill in the lymphoid tissues and organs, and lymph through the lymph vessels. lymphoid organs are the heart of the thymus, bone (in birds storage), spleen, lymph nodes, tonsils, Peyer's patches and lymphoid tissues of the respiratory tract and stomach.
Most lymphocytes in the blood is at a standstill. They look like small, round cells with a compact core that takes up almost the entire cell volume. Accordingly, the cytoplasm is very low. Lymphocytes in lymphoid tissues and organs can activate different amounts of antigen stimulation. The blood cells are 20-40% of all leukocytes soft and larger than red blood cells.
Lymphocytes are the main components of the immune system's defense against attacking pathogens such as viruses, bacteria, fungi and protists. performance and cell antibodies in is a molecule that can bind to a form of complementary molecules, called antigens, and recognition. Like all proteins, although antibodies encoded by the genes. Based on the mechanism of recombination of some of these genes, each cell produces antibodies specifically.
Thus, cells that perform a specific action under the name of each additional recognize antigen only. Although all cells are highly selective recognition of molecules, the number of circulating lymphocytes, so large that they are able to detect almost all substances in the body, both domestic and foreign. It is about recognizing the hundreds of millions of different molecules.In addition, Th cells and B, a third population of lymphocytes in peripheral blood and lymphoid organs have receptors for antigens. These cells are non-specific defense function is not activated Th cells, these cells are the oldest part of the immune system and is characterized by cytotoxic activity. For these reasons, called NK, natural killer. In addition to killing viruses, bacteria, infections and neoplastic cells, these cells and regulates the production of other blood cells, red blood cells and granulocytes.
