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The blood is an animate tissue that contains liquid and solids. The liquid portion called plasma is made of water, salts and proteins. More than half of the blood is plasma. The solid portion of the blood made up of red blood cells, white blood cells and platelets.
Red blood cells carry oxygen from lungs to body's organs and tissues. White blood cells struggle against infections and are part of the body's defense system. Platelets help blood to clot. Bone marrow, the spongy material inside your bones, produces new blood cells. Blood cells uninterruptedly die and the body produces new cells. Red blood cells live about 120 days, platelets 6 days and white cells less than a day.
There are many types of blood diseases, such as bleeding disorders, platelet disorders, hemophilia and anemia. If a person loses blood a transfusion may be needed.
Hematology is the science encompassing the medical study of the blood and blood-producing organs.
Branch of medicine concerned with the nature, function, and diseases of the blood. It covers the cellular and serum composition of blood, the coagulation process, blood-cell formation, hemoglobin synthesis, and disorders of all these. Marcello Malpighi, in the 17th century, was the first to examine red blood cells (erythrocytes). In the 18th century, the British physiologist William Hewson (1739 – 74) examined the lymphatic system and blood clotting. In the 19th century, the bone marrow was recognized as the site of blood-cell formation, and diseases of the blood such as anemia and leukemia were identified. In the early 20th century, the ABO blood-group system was discovered and the role of nutrition in blood formation was studied. Post-World War II studies have delved further into the nature of blood diseases and improved treatments and have examined hemoglobin synthesis and the role of platelets in blood coagulation.

Also read about Hematological Diseases.

All information on this page is intended for your general knowledge only and does not provide medical advice, diagnosis or treatment.