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Blood. Blood. Artery. White blood cells. Platelets. Red blood cells. Function Blood. Deliver O2 Remove metabolic wastes Maintain temperature, pH, and fluid volume Protection from blood loss- platelets Prevent infection- antibodies and WBC Transport hormones. Blood. Plasma- 55%. - PowerPoint PPT Presentation
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• Deliver O2
• Remove metabolic wastes
• Maintain temperature, pH, and fluid volume
• Protection from blood loss- platelets
• Prevent infection- antibodies and WBC
• Transport hormones
Types of Blood Cells
• Erythrocytes (red blood cells)
• Leukocytes (white blood cells)
• Platelets (thrombocytes)
Erythrocyte7.5m in dia Anucleate (no nucleus)- so can't reproduce;
however, reproduced in red bone marrow Hematopoiesis- production of RBC Function- transport respiratory gases Hemoglobin- quaternary structure, 2 chains
and 2 chains Lack mitochondria. Why? 1 RBC contains 280 million hemoglobin
molecules Men- 5 million cells/mm3
Women- 4.5 million cells/mm3
Life span 100-120 days and then destroyed in spleen (RBC graveyard)
Hematopoiesis
• Hematopoiesis (hemopoiesis): blood cell formation –Occurs in red bone marrow of
axial skeleton, girdles and proximal epiphyses of humerus and femur
Anemia- when blood has low O2 carrying capacity; insufficient RBC or iron deficiency.Factors that can cause anemia- exercise, B12 deficiency
RBC DiseasesRBC Diseases
Sickle-cell anemia-
•HbS results from a change in just one of the 287 amino acids in the chain in the globin molecule.
•Found in 1 out of 400 African Americans.
•Homozygous for sickle-cell is deadly, but in malaria infested countries, the heterozygous condition is beneficial.
RBC DiseasesRBC Diseases
Genetics of Sickle Cell Anemia
Genetics of Sickle Cell AnemiaGenetics of Sickle Cell AnemiaGenetics of Sickle Cell AnemiaGenetics of Sickle Cell Anemia
Polycythemia- excess of erythrocytes, viscosity of blood;8-11 million cells/mm3
Usually caused by cancer; however, naturally occurs at high elevationsBlood doping- in athletesremove blood 2 days before event and then replace it- banned by Olympics.
RBC DiseasesRBC Diseases
GranulocytesNeutrophils- 40-70%Eosinophils- 1-4%Basophils- <1%
AgranulocytesMonocytes- 4-8%
Lymphocytes- 20-45%
4,000-11,000 cells/mm 3
• Leukopenia
• Abnormally low WBC count—drug induced
• Leukemias
• Cancerous conditions involving WBCs
• Named according to the abnormal WBC clone involved
• Mononucleosis• highly contagious viral disease caused by
Epstein-Barr virus; excessive # of agranulocytes; fatigue, sore throat, recover in a few weeks
Platelets
• Small fragments of megakaryocytes• Formation is regulated by
thrombopoietin• Blue-staining outer region, purple
granules• Granules contain serotonin, Ca2+,
enzymes, ADP, and platelet-derived growth factor (PDGF)
Hemostasis- stoppage of bleeding
Tissue Damage
Platelet Plug
Clotting Factors
Platelets: 250,000-500,000 cells/mm3
Hemostasis(+ feedback)
Prothrombin
Thrombin
Fibrinogen Fibrin
Clotting Factorsthromboplastin
Traps RBC & platelets
Platelets release thromboplastin
Thromboembolytic Conditions
• Thrombus: clot that develops and persists in an unbroken blood vessel– May block circulation, leading to tissue death
• Embolus: a thrombus freely floating in the blood stream– Pulmonary emboli impair the ability of the body to
obtain oxygen– Cerebral emboli can cause strokes
Thromboembolytic Conditions
• Prevented by– Aspirin
• Antiprostaglandin that inhibits thromboxane A2
– Heparin• Anticoagulant used clinically for pre- and
postoperative cardiac care
– Warfarin• Used for those prone to atrial fibrillation
• Hemophilias include several similar hereditary bleeding disorders
• Symptoms include prolonged bleeding, especially into joint cavities
• Treated with plasma transfusions and injection of missing factors
Blood type is based on the presence of 2 major antigens in RBC membranes-- A and BBlood type Antigen Antibody
A A anti-BB B anti-A
A & B AB no anti bodyNeither A or B O anti-A and anti-B Antigen- protein on the surface of a RBC membrane
Antibody- proteins made by lymphocytes in plasma which are made in response to the presence of antigens.They attack foreign antigens, which result in clumping (agglutination)
Rh Factor and
Pregnancy
Rh+ mother w/Rh- baby– no problemRh- mother w/Rh+ baby– problemRh- mother w/Rh- father– no problemRh- mother w/Rh- baby-- no problem
RhoGAM used @ 28 weeks
Type AB- universal recipients
Type O- universal donor
Rh factor:
Rh+ 85% dominant in pop
Rh- 15% recessive
Blood Type Clumping Antibody
A antigen A anti-A serum antibody anti-b
B antigen B anti-B serum antibody anti-a
AB antigen A & B anti A & B serum -
O neither A or B no clumping w/ either anti A or B anti-a, anti-b
Figure 17.16
SerumAnti-A
RBCs
Anti-B
Type AB (containsagglutinogens A and B;agglutinates with bothsera)
Blood being tested
Type A (containsagglutinogen A;agglutinates with anti-A)
Type B (containsagglutinogen B;agglutinates with anti-B)
Type O (contains noagglutinogens; does notagglutinate with eitherserum)
Blood Type & Rh How Many Have It Frequency
O Rh Positive 1 person in 3 37.4%
O Rh Negative 1 person in 15 6.6%
A Rh Positive 1 person in 3 35.7%
A Rh Negative 1 person in 16 6.3%
B Rh Positive 1 person in 12 8.5%
B Rh Negative 1 person in 67 1.5%
AB Rh Positive 1 person in 29 3.4%
AB Rh Negative 1 person in 167 .6%
ABO Blood Types
PhenotypePhenotype GenotypeGenotypeOO i ii iAA I I A A I I AA or I or I A A
iiBB I I B B I I BB or I or I B B
iiABAB I I A A I I BB
INQUIRY1. What is an erythrocyte, leukocyte, and thrombocyte?2. What 2 things do red cells lack compared to white
cells?3. What dietary component is needed for the production
of red blood cells?4. The largest cells in the blood that leave the
bloodstream to become macrophages are ____.5. In an acute infection, the white cell count would show
as ______.6. Erythroblastosis fetalis , also known as hemolytic
newborn disease, occurs in ____ mothers carrying ____ fetuses.
7. What antigens and antibodies found on AB red cells?8. In a transfusion, what type blood can you give a type
O person?