Chapter 11 Blood Jeanelle F. Jimenez RN, BSN, CCRN

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Presentation transcript:

Chapter 11 Blood Jeanelle F. Jimenez RN, BSN, CCRN

BLOOD COMPOSITION (Table 11-1) Blood plasma Definition—blood minus its cells Composition—water containing many dissolved substances (e.g., foods, salts, and hormones) Amount of blood—varies with size and sex; 4 to 6 L about average; about 7% to 9% of body weight

BLOOD COMPOSITION Formed elements Types Count RBCs (erythrocytes) WBCs (leukocytes) Granular leukocytes—neutrophils, eosinophils, and basophils Nongranular leukocytes—lymphocytes and monocytes Platelets, or thrombocytes Count RBCs—4.5 to 5 million per mm3 of blood WBCs—5000 to 10,000 per mm3 of blood Platelets—300,000 per mm3 of blood Formation—red bone marrow (myeloid tissue) forms all blood cells except some lymphocytes and monocytes, which are formed by lymphatic tissue in the lymph nodes, thymus, and spleen

BLOOD COMPOSITION RBCs Structure—disk-shaped, without nuclei Functions—transport oxygen and carbon dioxide Anemia—inability of blood to carry adequate oxygen to tissues; caused, for example, by: Inadequate RBC numbers Deficiency of hemoglobin Pernicious anemia—deficiency of vitamin B12 Polycythemia—abnormally high RBC count

BLOOD COMPOSITION WBCs (leukocytes) General function—defense WBC count Differential WBC count reveals proportions of each type of WBC Leukopenia—abnormally low WBC count Leukocytosis—abnormally high WBC count Neutrophils and monocytes carry out phagocytosis Lymphocytes produce antibodies (B-lymphocytes) or directly attack foreign cells (T-lymphocytes) Eosinophils protect against parasitic irritants that cause allergies Basophils produce heparin, which inhibits clotting

BLOOD COMPOSITION WBC disorders Leukemia—cancer Elevated WBC count Cells do not function properly Type identified by how quickly symptoms appear and cell type involved Acute lymphocytic leukemia (ALL) Acute myeloid leukemia (AML) Chronic lymphocytic leukemia (CLL) Chronic myeloid leukemia (CML)

BLOOD COMPOSITION Platelets and blood clotting (Figure 11-6) Platelets play an essential role in blood clotting Blot clot formation Clotting factors released at the injury site produce prothrombin activator Prothrombin activator and calcium convert prothrombin to thrombin Thrombin triggers formation of fibrin, which traps RBCs to form a clot Follow along on page 290

BLOOD TYPES ABO system (Figure 11-7) Antigen—substance that can activate immune system Antibody—substance made by body in response to stimulation by an antigen Blood types Type A blood—type A self-antigens in RBCs; anti-B type antibodies in plasma Type B blood—type B self-antigens in RBCs; anti-A type antibodies in plasma Type AB blood—type A and type B self-antigens in RBCs; no anti-A or anti-B antibodies in plasma Type O blood—no type A or type B self-antigens in RBCs; both anti-A and anti-B antibodies in plasma

BLOOD TYPES Rh system Rh-positive blood—Rh factor antigen present in RBCs Rh-negative blood—no Rh factor present in RBCs; no anti-Rh antibodies present naturally in plasma; anti-Rh antibodies, however, appear in the plasma of Rh-negative persons if Rh-positive RBCs have been introduced into their bodies

BLOOD TYPES Universal donor and universal recipient blood Type O—universal donor blood Type AB+—universal recipient blood Erythroblastosis fetalis—may occur when Rh-negative mother carries a second Rh-positive fetus; caused by mother’s Rh antibodies reacting with baby’s Rh-positive cells