2. Combat infections Regulate body temperature Transport nutrients, oxygen and metabolic wastes

3.  Originate in bone marrow  Come from parent stem cells which mature into the various types of blood cells

4.  Plasma 55% of blood is plasma 91% water, 7% proteins, 2% other

5.  Water Maintains volume and pressure Transports nutrients and wastes  Proteins Albium, fibrinogen, immunoglobulins  Other Salts, oxygen, carbon dioxide, fats, glucose, amino acids, nitrogenous wastes, hormones and vitamins

6.  Red Blood Cells  White Blood Cells  Platelets

7.  Erythrocytes when mature lose nucleus and become biconcave  Haemoglobin transports oxygen, carbon dioxide and hydrogen ions  Antigens on red blood cells determines blood types

8.  Liver and kidneys are sensitive to low oxygen levels  Kidneys release REF and Liver releases globulins when oxygen in blood is low  Causes production of erythropoietin  Erythropoietin stimulates stem cells in bone marrow to increase production of RBC’s

9.  Granular Leukocytes Basophils Eosinophils Neutrophils  Agranular Leukocytes Lymphocytes Monocytes

11.  When platelets are damaged when impacting a damaged blood vessel it triggers the clotting process