Monday, September 2, 2019
A Speech to Be Delivered to the Parents Teachers Association the Causes of Student Unrest and Suggest How It Can Be Prevented
Composition of Blood Blood contains a nonliving fluid matrix (plasma) in which living cells (formed elements) are suspended. Blood contains 55% plasma and 45% formed elements. Plasma is over 90% water. It also contains electrolytes (salts), plasma proteins, and substances transported by blood (i. e. nutrients, hormones, etc. ). The three types of formed elements are erythrocytes (RBCs), leukocytes (WBCs), and platelets FUNCTIONS OF BLOOD functionsà of theà bloodà are: o transportà oxygenà away from the lungs and around the body; andà CO2à from the body cells to the lungs. to transportà nutrientsà such as glucose and amino acids from the digestive system to the cells in our bodies. to takeà waste productsà such as lactic acid away from the muscles when it's produced by anaerobic respiration; and urea from the liver to the kidneys and bladder. By maintaining a good circulation, the bloodflow keeps your core bodyà temperature BLOOD DISEASES lood disease,à any d isease of theà blood, involving the red blood cells erythrocytes, white blood cells leukocytes, orà plateletsà (thrombocytes) or the tissues in which these elements are formedââ¬âtheà bone marrow,à lymph nodes, andà spleen or ofà bleeding and blood clotting. Long before the nature and composition of blood were known, a variety of symptoms were attributed to disordered blood. Red blood cells were not recognized until the 17th century, and it was another 100 years before one of the types of white blood cells, theà lymphocyte, and the clotting of blood (coagulation) were described.In the 19th century other forms of leukocytes were discovered, and a number of diseases of the blood and blood-forming organs were distinguished. Morphological changesââ¬âthe changes in form and structureââ¬âthat take place in the blood during disease and the signs and symptoms of the various blood diseases were described in the 19th century and the first quarter of the 20th centur y. In the years that followed, a more physiological approach began to develop, concerned with the mechanisms underlying the development of blood disease and with the ways in which abnormalities might be corrected.
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