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Chapter 17
Blood
| Question | Answer |
|---|---|
| Blood: a fluid connective tissue composed of | Plasma :liquid portion |
| Erythrocytes | Red Blood Cells |
| Leukocytes | White Blood Cells |
| Hematocrit | Percent of blood volume that is RBCs |
| what is the percentage of RBC in Males | 47% |
| what is the percentage of RBC in Females | 42% |
| Physical Characteristics of blood | Sticky, opaque fluid Color scarlet to dark red pH 7.35–7.45 |
| Tempature of blood and percentage of body weight ? | 38 C and 8 % of body weight |
| Average volume of blood in males and females ? | Males 5-6 L and Females 4-5 L |
| What are the functions of blood ? | Distribution of blood O2 and nutrients to body cells Metabolic wastes to the lungs and kidneys for elimination Hormones from endocrine organs to target organs |
| What are blood regulations ? | Regulation of blood Body temperature by absorbing and distributing heat Normal pH using buffers Adequate fluid volume in the circulatory system |
| What does blood protect ? | Protection against Blood loss Plasma proteins and platelets initiate clot formation Infection Antibodies Complement proteins WBCs defend against foreign invaders |
| What is 90% of water and its Proteins are mostly produced by the liver & are the most abundant solutes ( 8% by wt ) in the plasma. | Blood Plasma |
| What is the percentage of albumin in blood plasma ? | 60% |
| Blood plasma has _________ _________of metabolism—lactic acid, urea, creatinine | Nitrogenous by-products |
| Blood Plasma has ____________—glucose, carbohydrates, amino acids Electrolytes—Na+, K+, Ca2+, Cl–, HCO3– Respiratory gases—O2 and CO2 Hormones | Nutrients |
| Only _______are complete cells | White Blood Cells |
| _________have no nuclei or organelles | Red Blood Cells |
| __________are cell fragments | Platelets |
| Most blood cells originate in what and do not divide ? | Bone Marrow |
| What are biconcave discs, anucleate, essentially no organelles and Filled with hemoglobin (Hb) for gas transport | Erythrocytes |
| Erythrocytes contain the plasma membrane protein _______and other proteins,Which Provide flexibility to change shape as necessary. | spectrin |
| Erythrocytes are the major factor contributing to | blood viscosity |
| Structural characteristics contribute to gas transport Biconcave shape—huge surface area relative to volume >97% hemoglobin (not counting water) | Erythrocytes |
| What are the fuctions of Erythocytes ? | RBCs are dedicated to respiratory gas transport |
| Hemoglobin binds reversibly with what ? | Oxygen |
| What is the hemoglobin structure of Erythocytes ? | Protein globin: two alpha and two beta chains Heme pigment bonded to each globin chain |
| Each Hb molecule can transport | four O2 and 1 billion RBC |
| O2 loading in the lungs Produces what ? | Oxyhemoglobin (Ruby red) |
| O2 unloading in the tissues produces what ? | deoxyhemoglobin or reduced hemoglobin (dark red) |
| CO2 loading in the tissues Produces _____________(carries 20% of CO2 in the blood) | carbaminohemoglobin |
| What is the process of blood cell formation and Occurs in red bone marrow of axial skeleton, girdles and proximal epiphyses of humerus and femur | Hematopoiesis |
| What gives rise to all formed elements Hormones and growth factors push the cell toward a specific pathway of blood cell development | Hemocytoblasts |
| red blood cell production is known as | Erythropoiesis |
| A hemocytoblast is transformed into a | proerythroblast |
| Proerythroblasts develop into early | early erythroblasts |
| Erythropoiesis phases in development | 1.Ribosome synthesis 2.Hemoglobin accumulation 3.Ejection of the nucleus and formation of reticulocytes |
| Too few RBCs leads to | tissue hypoxia |
| Too many RBCs increases | blood viscosity |
| Balance between RBC production and destruction depends on | Hormonal controls Adequate supplies of iron, amino acids, and B vitamins |
| This substance is a direct stimulus for erythropoiesis Released by the kidneys in response to hypoxia ? | Erythropoietin |
| Causes of hypoxia | Hemorrhage or increased RBC destruction reduces RBC numbers Insufficient hemoglobin (e.g., iron deficiency) Reduced availability of O2 (e.g., high altitudes |
| Effects of EPO | More rapid maturation of committed bone marrow cells Increased circulating reticulocyte count in 1–2 days |
| Testosterone also enhances EPO production, resulting in higher ____counts in males | RBC |
| Life span of erythocyctes : Old RBCs become fragile, and Hb begins to degenerate | 100–120 days |
| Heme and globin are | Separated |
| What is salvaged for reuse ? | Iron |
| Heme is degraded to yellow the pigment | bilirubin |
| the body in feces as | stercobilin |
| Globin is metabolized into | amino acids |
| Blood has abnormally low O2-carrying capacity and is accompanied by fatigue, paleness, shortness of breath, and chills is known as ? | Anemia |
| Deficiency of vitamin B12 Lack of intrinsic factor needed for absorption of B12 Treated by intramuscular injection of B12 or application of Nascobal | Pernicious anemia |
| Absent or faulty globin chain RBCs are thin, delicate, and deficient in hemoglobin | Thalassemias |
| Defective gene codes for abnormal hemoglobin (HbS) Causes RBCs to become sickle shaped in low-oxygen situations | Sickle-cell anemia |
| excess of RBCs that increase blood viscosity | Polycythemia |
| Results from: Polycythemia vera—bone marrow cancer Secondary polycythemia—when less O2 is available (high altitude) or when EPO production increases Blood doping | Polycythemia |
| What makes up <1% of total blood volume Can leave capillaries via diapedesis Move through tissue spaces by ameboid motion and positive chemotaxis | Leukocytes |
| what has WBC count over 11,000/mm3 Normal response to bacterial or viral invasion | Leukocytosis |
| What are neutrophils, eosinophils, and basophils | Granulocytes |
| what has the most numerous WBCs Polymorphonuclear leukocytes (PMNs) Fine granules take up both acidic and basic dyes Give the cytoplasm a lilac color Granules contain hydrolytic enzymes or defensins Very phagocytic—“bacteria slayers” | neutrophils |
| What is Red-staining, bilobed nuclei Red to crimson (acidophilic) coarse, lysosome-like granules Digest parasitic worms that are too large to be phagocytized | eosinophils |
| Rarest WBCs Large, purplish-black (basophilic) granules contain histamine | Basophils |
| an inflammatory chemical that acts as a vasodilator and attracts other WBCs to inflamed sites | Histamine |
| lymphocytes and monocytes Lack visible cytoplasmic granules Have spherical or kidney-shaped nuclei | Agranulocytes |
| Large, dark-purple, circular nuclei with a thin rim of blue cytoplasm Mostly in lymphoid tissue; few circulate in the blood Crucial to immunity | Lymphocytes |
| act against virus-infected cells and tumor cells | T-Cells |
| give rise to plasma cells, which produce antibodies | B-Cells |
| The largest leukocytes Abundant pale-blue cytoplasm Dark purple-staining, U- or kidney-shaped nuclei | Monocyte |
| Leave circulation, enter tissues, and differentiate into macrophages | Monocytes |
| Actively ________________; crucial against viruses, intracellular bacterial parasites, and chronic infections | phagocytic cells |
| Monocytes activate ____________to mount an immune response | lymphocytes |
| The Production of WBCs Stimulated by chemical messengers from bone marrow and mature WBCs | Leukopoiesis |
| Abnormally low WBC count—drug induced | Leukopenia |
| Bone marrow totally occupied with cancerous leukocytes Immature nonfunctional WBCs in the bloodstream Death caused by internal hemorrhage and overwhelming infections | Leukemia |
| Small fragments of megakaryocytes Formation is regulated by thrombopoietin | Platelets |
| Form a temporary platelet plug that helps seal breaks in blood vessels Circulating platelets are kept inactive and mobile by NO and prostacyclin from endothelial cells of blood vessels | Platelets |
| Infectious mononucleosis: highly contagious viral disease. Etiology Epstein-Barr virus. The hallmark of this disease is excessive numbers of agranulocytes. Symptoms include fatigue, chronic sore throat, low-grade fever, general malaise. | Mono |
| Fast series of reactions for stoppage of bleeding | 1.Vascular spasm 2.Platelet plug formation 3.Coagulation (blood clotting) |
| Platelet Plug Formation: Positive Feedback Cycle | At site of blood vessel injury, platelets Stick to exposed collagen fibers with the help of von Willebrand factor, a plasma protein Swell, become spiked and sticky, and release chemical messengers |
| Normally platelets do not stick together or to | endothelial lining. |
| Intact endothelial lining releases __________preventing platelet aggregation. (prostacyclin). | Chemicals |
| When endothelial lining is damaged, ___________ are exposed and platelet stick to this tenaciously | collagen fibers |
| All blood clotting factors normally circulate in the blood in the | inactive form until mobilized |
| A set of reactions in which blood is transformed from a liquid to a gel | Coagulation |
| Coagulation reinforces the platelet plug with | fibrin threads |
| what are the three phases of coagulation | 1.Prothrombin activator is formed (intrinsic and extrinsic pathways) 2.Prothrombin is converted into thrombin 3.Thrombin catalyzes the soluble fibrinogen into insoluble fibrin mesh. |
| Is triggered by negatively charged surfaces (activated platelets, collagen, glass) Uses factors present within the blood (intrinsic) | Intrinsic pathway |
| Is triggered by exposure to tissue factor (TF) or factor III (an extrinsic factor) Bypasses several steps of the intrinsic pathway, so is faster | Extrinsic pathway |
| Prothrombin activator catalyzes the transformation of prothrombin to the active enzyme | thrombin |
| Thrombin converts fibrinogen to | fibrin |
| Actin and myosin in platelets contract within | 30–60 minutes |
| stimulates division of smooth muscle cells and fibroblasts to rebuild blood vessel wall | Platelet-derived growth factor |
| stimulates endothelial cells to multiply and restore the endothelial lining | Vascular endothelial growth factor |
| Begins within two days Plasminogen in a clot is converted to plasmin by tissue plasminogen activator (tPA), factor XII and thrombin | |
| Plasmin is a | fibrin-digesting enzyme |
| clot that develops and persists in an unbroken blood vessel May block circulation, leading to tissue death | Thrombus |
| a thrombus freely floating in the blood stream | Embolus |
| deficient number of circulating platelets Petechiae appear due to spontaneous, widespread hemorrhage Due to suppression or destruction of bone marrow (e.g., malignancy, radiation) | Thrombocytopenia |
| Humans have ____ varieties of naturally occurring RBC antigens | 30 |
| When serum containing anti-A or anti-B agglutinins (antibodies) is added to blood, agglutination will occur between the agglutinin and the corresponding | agglutinogens(antigens) |
Created by:
jennysevere24
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