Blood supplies the body with oxygen and nutrients to cells and also contributes to the removal of “waste products” from. It consists of 55% plasma , a watery fluid, and 44% of cellular components (mainly red and white blood cells that are formed in the bone marrow). At low levels found in the blood and hormones , gases, nutrients and metabolic products. Because the blood is for each body part is of enormous significance and it fulfills so many tasks to consider diseases of the blood throughout the body affected.

The blood is pumped from the heart through the blood vessels that run throughout the body. The blood vessels leading to the heart are called veins, which lead away from the heart arteries. The average amount of blood in humans is five to six liters. In addition to the transport of oxygen and nutrients and the removal of waste products, blood has other important tasks. The constant circulation keeps the temperature constant and keep the water and electrolyte balance. The blood is also an important part of the human immune system, the pathogens by antibodies and phagocytes fight. Blood clotting is also a vital first step in the healing of injuries.

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The ingenious transportation and defense systems, however, some blood diseases threatening to limit its effectiveness and for affected persons may even be fatal. These include blood clotting disorders, anemia (anemia) and leukemia (blood cancer). Less well known are the porphyrias, a group of blood diseases, is where the formation of red blood cells (heme) is disturbed. Depending on what stage of heme formation occurs, the fault to show different symptoms such as nausea, abdominal pain, psychosis, liver problems, severe light sensitivity of the skin and tissue death on the nose, ears, lips or fingers. The erythrocytosis is the abnormal proliferation of red blood cells (RBCs), as it were the opposite of leukemia. This can lead to fatigue, headaches, high blood pressure and blurred vision.