The Composition of Blood 0.0 / 5 ? BiologyBloodASCCEA Created by: LucilleeCreated on: 26-04-17 13:53 Erthrocytes (Red Blood Cells) About 5 million in each mm squared of blood They are small cells (7-8 micrometers) Biconcave shape creates a high SA/V ratio They have no nucleus or organelles (more room for haemoglobin) Adapted to carry oxygen (haemoglobin) - each red blood cell has around 300 million molecules of haemoglobin 1 of 6 Platelets cell fragments that have a role in clotting and repairing minor breaks in blood vessels 2 of 6 Plasma Transports blood cells, glucose, amino acids, other products of digestion, ions, carbon dioxide, urea, heat, prothrombin, fibrinogen and clotting factors. 90% water and 10% other substances 3 of 6 Polymorphs (microphages) Most common white blood cell (70% of white blood cells) Multi-lobed nucleus and granular cytoplasm Are phagocytic and pass between squamous epithelium to destroy bacteria and other foreign bodies at sites of infection 4 of 6 Monocytes Largest but least common (5% of white blood cells) Bean shaped nucleus Are phagocytic and move out of blood at sites of infection and develop into phagocytic macrophage cells to destroy bacteria Longer lived than polymorphs 5 of 6 Lymphocytes Make up 20-25% of white blood cells Very large nucleus and small cytoplasm B-cells: involved in antibody production T-cells: involved in cell-mediated immunity (destroying infected and foreign cells) 6 of 6
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