BLOOD - PowerPoint PPT Presentation

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BLOOD

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  1. BLOOD

  2. Blood transports substances and maintains homeostasis in the body Hematophobia= fear of blood

  3. Blood and Blood Cells Blood is a type of CONNECTIVE TISSUE It has two basic components: CELLS  (rbc, wbc, platelets)  = 45% Plasma (water, proteins, amino acids..etc)  = 55%

  4. Hematocrit - volume of blood cells in a sample, should be 45%. The remaining fluid is plasma (55%). To determine the percentages, blood is placed in a centrifuge

  5. Three Types of Blood Cells red blood cells (erythrocytes)white blood cells (leukocytes)platelets (thrombocytes)

  6. Biconcave discs 5 million per cubic millimeter Lack nuclei HEMATOPOEISIS – formation of blood cells (bone marrow) Liver & Spleen - phagocytosis

  7. Main Functions of RBCs Transports oxygen, picks up carbon dioxide HEMOGLOBIN - molecule that combines with O2 IRON is critical to synthesize hemoglobin

  8. Oxygen Levels Oxyhemoglobin =         plenty of oxygen; bright red Deoxyhemoglobin =         low in O2, “bluish red”

  9. It is a myth that deoxygenated blood appears blue.  The blood on the left is oxygenated, the right is deoxygenated blood (from a vein) Source:  Wikipedia Commons

  10. Elements Critical to RBC Production Folic Acid Vitamin B12 Iron Too few RBC = anemia

  11. WHITE BLOOD CELLS(Leukocytes) General function is to protect the body against disease There are FIVE different kinds of WBCs Granulocytes (granular cytoplasm)           Neutrophils, Eosinophils, Basophils Agranulocytes (lacking granular cytoplasm)            Monocytes, Lymphocytes

  12. Neutrophil (nucleus has several lobes) Active phagocytes 60% of WBC Present in the pus of wounds

  13. Basophil Produces Heparin and Histamines Important in Inflammatory Reaction 1% WBC

  14. Eosinophil Mainly attack parasites 2% WBC

  15. Monocyte (larger cell, horseshoe shaped nucleus) Become macro-phages

  16. Lymphocyte(nucleus is dark and takes up almost whole cell; almost no cytoplasm seen) Defense against invaders Yield Antibodies 30% WBC

  17. Left: Lymphoctye | Right: Neutrophil

  18. Platelets (thrombocytes) Blood clots and vessel repair

  19. Plasma Proteins Albumins – blood pressure Globulins (alpha, beta, gamma) – transport lipids and antibodies for immunity Fibrinogen – important for blood clotting MAJOR EVENT IN BLOOD CLOTTING = Fibrinogen converted to FIBRIN

  20. PLASMA The liquid portion of blood is 92% water Also contains nutrients, gases, vitamins (etc) and plasma proteins

  21. This machine removes the plasma from the blood and returns the RBC’s to the donor.

  22. HEMOSTASIS The process of stopping bleeding Involves the coagulation and clotting of the blood to seal the site of damage

  23. THREE EVENTS IN HEMOSTASIS 1.  Blood Vessel Spasm    Seratonin = vasoconstrictor 2.  Platelet plug formation 3.   Blood coagulation conversion of fibrinogen to fibrin *thrombin is an enzyme that causes the conversion

  24. Hemostasis Blood Clot Formation Animated(Video) 2D animation Medivisual

  25. COAGULATION  -  the thickening of blood to form a clot  (hematoma)

  26. THROMBUS – blood clot (abnormal) EMBOLUS – when the clot moves to another place.

  27.  What is DVT?        Video:  Deep Vein Thrombosis What is a Pulmonary Embolism?          Video:  Pulmonary Embolism