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) argon 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 functionsof thebloodare o transportoxygenaway from the lungs and around the body andCO2from the body cells to the lungs. to transportnutrientssuch as glucose and amino acids from the digestive system to the cells in our bodies. to takewaste productssuch as lactic acid away from the muscles when its produced by anaerobic respiration and urea from the liver to the kidneys and bladder. By maintaining a considerably circulation, the bloodflow keeps your core bodytemperature BLOOD DISEASES lood disease,any disease of theblood, involving the red blood c ells erythrocytes, white blood cells leukocytes, orplatelets(thrombocytes) or the tissues in which these elements are formedthe elevate marrow,lymph nodes, andspleen or ofbleeding 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, thelymphocyte, and the clotting of blood (coagulation) were set forth.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 changesthe changes in form and structurethat 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 century. In the years that followed, a more physiological approach began to develop, concerned with th e mechanisms underlying the evolution of blood disease and with the ways in which abnormalities might be corrected.