Blood. Blood. Blood Composition. Blood Composition. Fractionation & Hemopoesis
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1 Blood Blood Chapter 19 Blood is a specialized fluid connective tissue that contains cells suspended in a fluid matrix Functions of blood include: Transport of dissolved gases, nutrients, hormones and metabolic wastes Regulation of the ph and ion composition of interstitial fluids Restriction of fluid loss at injury sites Defense against toxins and pathogens Stabilization of body temperature Blood Composition Blood consists of plasma and formed elements Blood plasma is the fluid matrix that contains plasma proteins in solution Formed elements are blood cells and cell fragments that are suspended in the plasma The formed elements consist of Red Blood Cells (RBCs) White Blood Cells (WBCs) Platelets Blood Composition Red blood cells, or erythrocytes, are the most abundant blood cells and are essential for the transport of oxygen White blood cells, or leukocytes, are involve with the body s defense Platelets are small, membrane bound, cell fragments that contain enzymes and other substances involve in clotting Fractionation & Hemopoesis Plasma and the formed elements constitute whole blood The components of whole blood can be separated, or fractionated, by centrifugation, for analytical or clinical purposes Hemopoesis is the process of blood cell formation Hemocytoblasts are circulating stem cells that divide to form all types of blood cells 1
2 Plasma Plasma constitutes 46-63% of whole blood volume with water accounting for 92% of the plasma volume Plasma proteins make up about 7% of the volume of plasma Most plasma proteins are large and therefore do not readily cross capillary walls 90% of plasma proteins are produced by the liver Plasma Proteins The three primary classes of plasma proteins; albumins, globulins, and fibrinogens, account for 99% of the plasma proteins, the remainder consists of enzymes, hormones, and prohormones Albumins comprise 60% of the plasma proteins and are responsible for maintaining the viscosity and osmotic pressure of blood as well as the transport of some hormones Plasma Proteins Globulins comprise around 35% of the plasma proteins Antibodies, or immunoglobulins, attack foreign proteins and pathogens Transport globulins li bind small ions, hormones, and other compounds so that they are not lost at the kidneys Fibrinogens accounts for about 5% of the plasma proteins and combine to form fibrin, the basic framework of a blood clot Red Blood Cells Red blood cells are the most abundant blood cells, accounting for 99.9% of the formed elements Red blood cells contain hemoglobin, which binds and transports oxygen and carbon dioxide A red blood cell count is the number of RBCs per μl l of whole blood In adult males, the red count is million and in females million A hematocrit is the percentage of whole blood occupied by RBCs and averages 46 in adult males and 42 in females RBC Structure Each RBC is a biconcave disc with a thin central region and a thicker outer margin This shape provides a large surface to volume ratio which increases the efficiency of gas exchange In addition the shape of RBCs allows them to stack, bend, and flex, thus easing flow through small capillaries 2
3 RBC Structure RBCs lose their nuclei shortly after they are formed and have no organelles As a result their lifespan is relatively short, usually less than 120 days Since they have no mitochondria, they must obtain their nutrients through the anaerobic metabolism of glucose absorbed from the surrounding plasma Hemoglobin (Hb) Molecules of hemoglobin account for 95% of the intracellular proteins in RBCs Each Hb molecule consists of two alpha and two beta polypeptide p chains Each chain is a globular protein, similar to myoglobin, and containing a single heme molecule, a pigment complex Each heme holds an iron molecule in such a way that it can interact with an oxygen molecule, forming oxyhemoglobin HbO 2 Hemoglobin (Hb) Oxyhemoglobin is bright red The interaction of heme and oxygen is very weak and readily reversible h l bi i d k d Deoxyhemoglobin is dark red Fetal hemoglobin has a higher affinity for oxygen than adult hemoglobin, thus a fetus can steal oxygen from the mothers blood at the placenta 3
4 RBC Lifespan and Circulation RBCs lead a hard life for their 120 days of existence As RBCs age and become damaged they are engulfed by phagocytes, usually before they hemolyze (rupture) If the Hb is released by hemolysis it is not recycled, Hb is only recycled if engulfed by phagocytes RBC Lifespan and Circulation The iron extracted from heme complexes may be bound and stored in phagocytes or released into the bloodstream In the bloodstream iron binds to transferrin, a plasma protein RBCs developing in bone marrow absorb amino acids and transferrin from the bloodstream and use them to synthesize Hb molecules RBC production Erythropoeisis, the formation of new red blood cells, occurs in red bone marrow Red bone marrow is found only in portions of the vertebrae, sternum, ribs, skull, scapulae, pelvis, and proximal limb bones As they mature, red blood cells pass through a number of stages RBC production Cells destined to become RBCs first differentiate into proerythroblasts, then through various erythroblast stages, in which Hb is produced After roughly four days of differentiation, the erythroblast sheds its nucleus and becomes a reticulocyte Hb production continues for two more days then the reticulocyte enters the bloodstream, becoming a mature RBC after about 24 hours in circulation 4
5 Regulation of Erythropoesis Erythropoesis is directly stimulated by the peptide hormone erythropoetin (aka EPO, erythropoesis stimulating hormone) and indirectly by thyroxine, androgens, and growth hormone, but not by estrogens EPO is a glycoprotein that appears in the plasma when peripheral tissues, especially the kidneys, are exposed to low oxygen levels Once in the bloodstream EPO travels to the red bone marrow, stimulates stem cells and speeds the maturation of developing RBCs Blood Types Blood type is determined by the presence or absence of cell surface antigens (agglutinogens) Individuals present antigens on their cell surface that identify the cell as self Antibodies in plasma bind to antigens that are not identified as self Three antigens of importance in blood typing are A, B and Rh (D) Blood Types The RBCs of an individual have Either A or B surface antigens Both A and B surface antigens Neither A nor B surface antigens Type A blood has type A antigens Type B blood has type B antigens Type AB blood has both A & B antigens Type O blood has neither A nor B antigens Blood Types The term Rh positive indicates the presence of the Rh antigen Likewise Rh negative indicates an absence of the Rh antigen Your immune system ignores the surface antigens of your own RBCs, that is your blood has no antibodies against your own antigens Your blood does contain antibodies (agglutinins) that will attack foreign antigens on RBCs Blood Types When these antibodies attack, the foreign cells clump together (agglutinate) and the process is called agglutination Type A blood contains anti B antibodies Type A blood contains anti-b antibodies Type B blood contains anti-a antibodies Type O blood contains both anti-a & anti-b antibodies Type AB blood contains neither antibody 5
6 Rh In contrast to antigens A & B, Rh negative individuals (no Rh antigen) do not necessarily contain Rh positive antibodies These antibodies are present only if the individual is sensitized by previous exposure to Rh positive RBCs This exposure can occur during transfusion or during the pregnancy of an Rh negative woman with an Rh positive child Testing for Compatibility At least 50 surface antigens have been identified on RBCs, but standard blood typing considers only those most likely to produce dangerous levels of agglutination; A, B, & Rh The test involves taking drops of blood and mixing them separately with solutions containing anti-a, anti-b, & anti-rh antibodies The resulting pattern of agglutination indicates blood type White Blood Cells Unlike RBCs, white blood cells have nuclei and organelles, but no hemoglobin WBCs, or leukocytes, help defend the body against invasion by pathogens, and remove toxins, wastes, and abnormal or damaged cells All are capable of amoeboid movement, migration out of the bloodstream and positive chemotaxis Some are capable of phagocytosis Types of WBC There are two major groups of WBCs; granular leukocytes and agranular leukocytes Granular leukocytes Neutrophils 50 to 70 % total WBC population Eosinophils phagocytes attracted to foreign compounds that have been marked with antibodies Basophils migrate to damaged tissue and release histamine and heparin 6
7 Types of WBC Agranular leukocytes Monocytes - can become macrophages Lymphocytes which includes T cells, B cells, and NK cells WBC Production Granulocytes and monocytes are produced by bone marrow stem cells Bone marrow stem cells divide to create progenitor cells Progenitor cells produce all formed elements except lymphocytes Several hormones, called colony stimulating factors, are involved in the regulation of WBC populations Platelets Platelets are flattened discs that are a major participant in the clotting system Platelets circulate for 9-12 days before being removed by phagocytes (at the spleen) About 1/3 of the platelets in the body are held in reserve in the spleen and other organs Platelet Function Platelets are important in transporting chemicals that help initiate and control clotting They form temporary patches (platelet plug) in the walls of damaged blood vessels Platelets actively contract after clot formation has occurred which reduces the size of the break in the blood vessel 7
8 Hemostasis The process of hemostasis prevents the loss of blood through damaged vessel walls At the same time, it establishes a framework for tissue repair Hemostasis consists of three phases: Vascular phase Platelet phase Coagulation phase Hemostasis During the vascular phase blood vessels constrict in a vascular spasm which involves the contraction of smooth muscle fibers in the vessel wall During the platelet phase, platelets begin to attach (via platelet adhesion) to the exposed tissue surfaces of the vessel As more platelets arrive they stick to one another and form a platelet plug Hemostasis During the coagulation phase factors released by platelets and endothelial cells interact with clotting factors to form a clot During the clotting gphase the clotting factors (enzymes and proenzymes) interact in a clotting cascade The three cascades involved are called the extrinsic (in the vessel wall), intrinsic (inside the bloodstream) and common (where both converge) pathways The common pathway The common pathway begins when enzymes from either the extrinsic or intrinsic pathway activate factor X, forming the enzyme prothrombinase Prothrombinase converts prothrombin into thrombin Thrombin completes the clotting process by converting fibrinogen, a plasma protein, into insoluble strand of fibrin 8
9 Clot retraction Clot retraction occurs over a period of minutes It pulls the torn edges of the vessels closer together, reducing residual bleeding and stabilizing the injury site It also reduces the size of the damaged area, making it easier for repairs to take place Fibrinolysis Fibrinolysis is the process by which the clot gradually dissolves Plasminogen is activated by thrombin and tissue plasminogen activator (t-pa) This produces the enzyme plasmin which digests fibrin strands and erodes the foundation of the clot 9
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