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 functions  of the  blood  are: o transport  oxygen  away from the lungs and around the body; and  CO2  from the body cells to the lungs. to transport  nutrients  such as glucose and amino acids from the digestive system to the cells in our bodies. to take  waste products  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 body  temperature BLOOD DISEASES lood disease,  any d isease of the  blood, involving the red blood cells erythrocytes, white blood cells leukocytes, or  platelets  (thrombocytes) or the tissues in which these elements are formed—the  bone marrow,  lymph nodes, and  spleen or of  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, the  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 changes—the changes in form and structure—that 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.