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Human blood

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  • 1. HUMAN BLOOD
  • 2. BLOOD CONSTITUENTS AND THEIR FUNCTION PLASMA • Pale yellowish liquid • 90% water • 10% soluble substances: nutrients, mineral salts, blood proteins, hormone • Transports substances needed by cells and removes waste products from cells. RED BLOOD CELLS • No nucleus • Biconcave disc-shaped • Carry O2 in the form of oxyhaemoglobin BLOOD CELL & PLATELETS WHITE BLOOD CELLS • Have nucleus • Irregular is shape • Protect the body against diseases and fight infection • • • • PLATELETS small fragments of cells Made in the bone marrow No nucleus Help in blood clotting
  • 3. PLATELET PLASMA WBC RBC
  • 4. THE BLOOD GROUPS A B AB O • Not all blood groups are compatible • Blood transfusion is the transfer of blood from a donor to a recipient • Mixing incompatible blood groups leads to blood clotting or agglutination, which is dangerous for the recipient.
  • 5. Donor-recipient compatibility RECIPIENT DONOR A B A AB O A B AB O
  • 6. O AB People with blood group O are called universal donors because they can donate to all blood groups. People with blood group AB are called universal recipients because they can receive blood from all blood groups.
  • 7. THE IMPORTANCE OF BLOOD DONATION • Blood has no substitute and cannot be manufactured synthetically. • Blood is needed for surgery, the victims of accidents and to treat patients with other sicknesses and also during childbirth.
  • 8. STORAGE & HANDLING DONATED BLOOD HANDLING • The donated blood is tested for the blood group. • Then is screened for diseases such as hepatitis B and C, HIV or sexually transmitted diseases • • • • • STORAGE May be stored as whole blood or separated into RBC, WBC, platelets or plasma. Collected in a plastic bag which contains a substance that prevent coagulation. Stored in blood banks at 4oC which can last for about 40 days. Fresh blood can last for 24 hours. Before transfusion, the bags are left at room temperature for 2 hours.

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