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11 Cards in this Set
- Front
- Back
Blood -
Interstitial fluid - |
Blood is a CT
a. matrix b. cell = rbs, wbc, platlets Widely sepearated in matrix Fluid that bathes body cells |
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Fxns of blood
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1.Transport- 02 to lungs, Co2 from tissue, nutrients, waste
2.Regulation a) maintain body temp (b) pH maintenance - pH buffers maintain in 7.35-7.45 range (c) water content of cells - ossmostic preesure 3.Protection a.Against blood loss - Clots b.Against disease 1.Fight invading organisms (phagocytosis) 2.Produce proteins (Ab, interferons, complement, etc.) |
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Characterisitics of Blood
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1.55% plasma and 45% formed elements (cells)
a.plasma 1.proteins 7% 2.water 91.5% 3.other solutes 1.5% b.formed elements (per microliter of blood) 1.RBC 4.8-5.4 million - most numberous 2.WBC 5,000-10,000 3.Platelets 150,000-400,000 2.Temperature of blood is 38C (100.4) 3.pH of blood is 7.35-7.45 4.20% extracellular fluid and 8% of the body mass 5.volume a.males 5 to 6 L (1.5 gallons) b.females 4 to 5 L (1.2 gallons) 6.withdrawing blood a. venipuncture b. finger/heel stick c. arterial stick |
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Blood Composition -
PLASMA |
1.Plasma: Watery liquid that forms the extracellular matrix and contains dissolved gases, hormones and other solutes
b.91.5% water and 8.5% solutes (majority of solutes are proteins) A.Plasma proteins 1. Regulate osmotic pressure (impact fluid exchange at capillary walls) 2.Albumins (54%)- transport lipids (steriods) fatty acids 3.Globulins (38%) - made by plasma cells - WBC that produce antibodies, transport fat soluable vitamens 4.Fibrinogen (7%)- blood clotting transport d. Other solutes in Plasma (remaining 1%) 1.Electrolytes (IONS) i.Inorganic salts ii.Cations (Na+, K+, Ca2+, Mg2+) iii.Anions (Cl-, HPO42-, SO42- HCO3-) 2.Nutrients i.Amino acids - building blocks for proteins ii.Glucose iii.Fatty acids iv.Glycerol v.Vitamins vi.minerals 3.Gases: O2, CO2, N2 4.Regulatory Substances i. Enzymes ii. Hormones iii. Cofactors (vitamins) 5.Waste i.CO2 (krebs cycle) ii.Urea iii.Uric Acid iv.Creatine v.Creatinine vi.Bilirubin vii.Ammonia |
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Blood Composition-
FORMED ELEMENTS |
2.Formed Elements: cells and cell fragments
1.Erythrocytes (RBC) - most numerous in millions 2.Thrombocytes (platelets) - second in hundreds of thousands 3.Leukocytes (WBC) - least numerous (5-10K)= 2 kinds: i.Granular - have vessicles/ granuals seen 1. Neutrophils (60-70%) 2. Eosinophils (2-4%) 3. Basophils (0.5-1%) ii.Agranular 1. Monocytes (3-8%) 2. Lymphocytes (20-25%) a. T-Cells(T-lymphocyte) b. B-Cells (B-lymphocyte |
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Hematocrit
Complete blood count |
Hematocrit: Blood volume occupied by RBCs
2.40 indicates 40% of the volume is composed of RBCs 3.normal range - (Females = 38-46, Males = 40-54) 4.testosterone stimulates erythropoietin (EPO) 5.Anemia: Lower than normal hematocrit in most cases ii. Hemorrhagic - b/c of bleeding iii. Pernicious - vitamen B12 deficency iv. Sickle cell - genetic, RBC's have wrong shape v. Hypochromic - Iron defiency vi. Hemolytic - microbe causing RBC's to pop 6.Erythrocytosis - High RBC's, blood too thick, heart works too hard, cardiac arrest i. Direct damage - impact bone marrow ii. Indirect Damage - smoking, copd, altitude sickness 1. Polycythemia- cancer c. CBC – complete blood count 1. RBC 2. WBC 3. Platelet 4. Hematocrit 5. Differential WBC count 6. Hb (g/100 ml) |
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Formation of Blood Cells
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1.Hemopoiesis (Hematopoiesis)
a. Before birth – yolk sac b. Last trimester and throughout life –FETUS: liver, spleen, thymus, lymph nodes c. LIFE – Red bone marrow 2.General Information d. life of formed elements is hours, days or weeks – memory cells and lymphocytes= years e. Formation of RBCs and Platelets – regulated by negative feedback, # RBC’s stay relatively constant = 2 million cells per second made f. Formation of WBCs 2.Red Bone Marrow g. Location – Epipyses, shoulder and pelvic gurdle, h. Red marrow decreases and yellow increases as we age Mesenchymal cells (pluripotent stem cells): Reproduce themselves and differentiate into several cell types 1. Also called hemocytoblasts (1% of red bone marrow) 2,Regulation of Hemopoiesis Hemopoietic growth factors – 3 chemicals that control j. Erythropoietin (EPO) k. Thrombopoietin (TPO) l. Cytokines – small glycoprotiens, act as local hormones, stimulate proliferation |
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Erythrocytes
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1.Anatomy of Erythrocytes - Morphology
a. Biconcave discs – decreases distance between membranes b. 7 µm in diameter c. glycolipids in cell membrane are antigenic – capable of generating an immune response 1. result in ABO and Rh blood groups d. anucleate – no nucleus, no significant metabolic activity, no cell divisions e. Cytoplasm filled with hemoglobin molecules 1. 33% cell weight 2. normal Hb ranges: Infant = 10-20g/ 100mL, Adults: F = 12-16g, M= 13.5-18g 3. synthesized before nuclear ejection i. Hb – protein of 4 subunits (2 alpha, 2 beta 4. at the center of each chain is a non-protein ring containing Fe2+ 1. Hb – Heme portion has Fe – can reversibly bind to O2 5. Hb transports 23% of the total CO2 f. Each RBC has 280 million Hb molecules to transport O2 2.Functions g. Transport O2 and CO2 1. hemoglobin-oxygen binding affinity 2. relationship between % saturation (amt O2 bound to heme/ total hemoglobin) & PO2 is not a straight line 3. oxygen dissociation curve i. hypoxic RBC (Hb) return to the heart from the body through veins 1. heart pumps this blood to the lungs 2. PO2 in lungs is high, so O2 binds to Hb and circulates back to the heart ii. oxygen rich blood (HbO) leaves heart & circulates to O2 hungry cells through arteries iii. P02 decreases as RBC move away from the lungs, which causes O2 to leave Hb and move into the cells iv. Regulate blood flow and pressure (GRAPH) 2. Life Cycle a. Live for 120 days b. Ruptured RBCs are removed from circulation c. Destruction and Recycling of RBCs 1. Phagocytosis of ruptures / worn RBCs by Mø in spleen and liver 2. Split globin from heme i. Globin is lysed into amino acids ii. Heme 1. Iron portion – Fe+2 removed by Fe+3, Fe+3 bind to protein in blood and is carried to liver, attaches to ferritan 2. Non-iron portion of heme – Converts to billirubin green – bilirubin red – dump into blood stream and goes back to liver, liver excretes it with bile, GI tract, feces 3. Formation of RBCs a. Resources b. Erythropoiesis 1. Proerythroblast divides several times 2. Cells then begin to synthesize Hb 3. Nuclear ejection marks the start of the reticulocyte – gets bicanvavity 4. Stimuli for Erythropoiesis (a) hypoxia (b) premature infant, not enough EPO |
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Specific Pathways:
RBC PLATELETS GRANULOCYTIC LEUKOCYTES AGRANULOCYTIC LEUKOCYTES |
a. RBC
Pluripotent Stem Cell Myeloid Stem Cell CFU-erythrocyte Proerythroblast(ejection of nucleus) Reticulocyte RBC b. Platelets Pluripotent Stem Cell Myeloid Stem Cell CFU-megakaryocyte Megakaryoblast Megakaryocyte Thrombocytes c. Granulocytic Leukocytes Pluripotent Stem Cell Myeloid Stem Cell CFU-granulocyte macrophage Myeloblast Neutrophil Pluripotent Stem Cell Myeloid Stem Cell Eosinophilic myeloblast Eosinophil Pluripotent Stem Cell Myeloid Stem Cell Basophilic myeloblast Basophil d. Agranulocytic Leukocytes Pluripotent Stem Cell Myeloid Stem Cell CFU-granulocyte macrophage Monoblast Monocyte Macrophage Pluripotent Stem Cell Lymphoid Stem Cell T lymphoblast T-Cell Pluripotent Stem Cell Lymphoid Stem Cell B lymphoblast B-Cell Plasma Cell |
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Leukocytes
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1.General Information – Granular and Agranular
a. Possess nuclei and do not contain Hb b. Most live a few days, some few hours c. Leukocytosis – leukermia – too many over 10,000 d. Leukopenia – too few falls below 5,000 e. Emigration (diapedesis) of WBCs – leave blood site to go to site of infection and never return 1. Initiation Signal 2. Adhesion molecules help WBC stick to endothelium (2 types) i. Endothelial selectins ii. Neutrophil integrins 3. Chemotaxis draws WBCs to microbes f. Major Histocompatibility (MHC) Antigens |
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Classes of WBC's - Granular
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1.Neutrophil
i. Granules – small and evenly distributed ii. Nucleus – starts rod shaped, PNM nucleus w/ 3-5 lobs connected by a thin band iii. Clinical Indications INCREASE: stress infection, burn, bacteria DECREASE: B12 defiency, exposed to radiation, toxicity iv. Function 1. Neutrophils respond first to bacterial destruction of cells (Infection) 2. Engulf microbe via phagocytosis 3. Release chemicals to kill microbe 4. Defensins Proteins – fight bacterial/ fungal infections 2.Basophil i. Granules – round but not uniform – variable in size ii. Nucleus – 2 lobes with thin connection iii. Clinical Indications INCREASE: allergic rxn, leukemia, hypothyroidism DECREASE: Pregnant, ovulating, stressed, hyperthyriod iv. Function 1. Inflammation sites 2. Release granules 3. Intensify inflammation – heparin, histamine, serotonin 4. Involved in hypersensitivity response (allergic rxn) 5. Similar in function to mast cells 3.Eosinophil i. Granules – very large + uniform ii. Nucleus – 2 lobes with THICK connection iii. Clinical Indications INCREASE: allergic rxn, parasite, autoimmune disease DECREASE: drug toxicity, stress iv. Function 1. Release enzymes such as histaminase – reduce allergic rxn 2. Phagocytize antigen-antibody complexes 3. Fight certain parasitic worms |