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124 notecards = 31 pages (4 cards per page)

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Blood

front 1

Buffy Coat

back 1

A thin, whitish layer called the _______________ is present at the erythrocyte-plasma junction.

front 2

Hematocrit

back 2

Erythrocytes normally constitute about 45% of the total volume of a blood sample, a percentage known as the ____________.

front 3

Plasma

back 3

A straw-colored, sticky fluid. Makes up 55% of whole blood. Least dense component.

front 4

Albumin

back 4

Accounts for some 60% of plasma protein. It acts as a carrier to shuttle certain molecules through the circulation, is an important blood buffer, and is the major blood protein contributing to the plasma osmotic pressure.

front 5

Formed Elements

back 5

Erythrocytes, leukocytes, and platelets. 2 are not even true cells.

front 6

Erythrocytes or Red Blood Cells (RBCs)

back 6

Small cells, about 7.5 micrometers in diameter. Shaped like biconcave discs-flattened discs with depressed centers.

front 7

Hemoglobin

back 7

Protein that makes red blood cells red, binds easily and reversibly with oxygen, and most oxygen carried in blood is bound to it.

front 8

Heme

back 8

Hemoglobin is made up of the red __________ pigment bound to the protein globin.

front 9

Globin

back 9

Consists of four polypeptide chains-two alpha and two beta - each binding a ringlike heme group.

front 10

Oxyhemoglobin

back 10

When oxygen binds to iron, assumes a new 3D shape and becomes ruby red.

front 11

Deoxyhemoglobin

back 11

Oxygen detaches from iron, hemoglobin resumes its former shape, and the result is dark red.

front 12

Carbaminohemoglobin

back 12

About 20% of the carbon dioxide transported in the blood combines with hemoglobin, but it binds to globin's amino acids rather than to the heme group. This formation of __________________ occurs more readily when hemoglobin is in the reduced state (dissociated from oxygen).

front 13

Hematopoiesis

back 13

Blood cell formation.

front 14

Red Bone Marrow

back 14

Hematopoiesis occurs in the ____________, which is composed largely of a soft network of reticular connective tissue bordering on white blood capillaries called blood sinusoids.

front 15

Hematopoietic stem cell or hemocytoblast

back 15

All formed elements arise from this.

front 16

Erythropoiesis

back 16

Erythrocyte production

front 17

Myeloid Stem Cell

back 17

Erythropoiesis begins when a hematopoietic stem cell descendant called a _______________ transforms into a proerythroblast.

front 18

Proerythroblast

back 18

Gives rise to basophilic erythroblasts that produce huge numbers of ribosomes.

front 19

Basophilic Erythroblasts

back 19

produce huge numbers of ribosomes.
(Phase 1 of Ribosome synthesis)

front 20

Polychromatic Erythroblast
Orthochromatic Erythroblast

back 20

Hemoglobin is synthesized and iron accumulates as the basophilic erythroblast transforms into a _____________ and then an _____________.
(Phase 2 of Hemoglobin accumulation)

front 21

Reticulocyte

back 21

When an orthochromatic erythroblast has accumulated almost all of its hemoglobin, it ejects most of its organelles. Additionally, its nucleus degenerates and is pinched off, allowing the cell to collapse inward and eventually assume the biconcave shape. The result is the ______________ (essentially a young erythrocyte), so named because it still contains a scant reticulum of clumped ribosomes.
(Phase 3 of Ejection of nucleus)

front 22

Reticulocyte counts

back 22

Provide a rough index of the rate of RBC formation. Below or above the 1-2% reticulocytes range indicates abnormal rates of erythrocyte formation.

front 23

Erythropoietin (EPO)

back 23

A glycoprotein hormone, stimulates the formation of erythrocytes.

front 24

Ferritin & Hemosiderin

back 24

Protein-iron complexes

front 25

Transferrin

back 25

Transport protein that transports iron in blood.

front 26

Bilirubin

back 26

A yellow pigment that is released to the blood and binds to albumin for transport.

front 27

Anemia

back 27

A condition in which the blood's oxygen-carrying capacity is too low to support normal metabolism.

front 28

Microcytes

back 28

Erythrocytes produced in response to anemia. They are small and pale because they cannot synthesize their normal complement of hemoglobin.

front 29

Intrinsic Factor

back 29

A substance that must be present for Vitamin B12 to be absorbed by intestinal cells.

front 30

Macrocytes

back 30

Without vitamin B12, developing erythrocytes grow but cannot divide, and so these large, pale cells result.

front 31

Thalassemias

back 31

Typically occur in people of Mediterranean ancestry, such as Greek and Italians. One of the globin chains is absent or faulty, and the erythrocytes are thin, delicate, and deficient in hemoglobin.

front 32

Sickle-cell Anemia

back 32

The havoc caused by the abnormal hemoglobin, hemoglobin S (HbS), results from a change in just one of the 146 amino acids in a beta chain of the globin molecule.

front 33

Polycythemia

back 33

"Many blood cells" - is an abnormal excess of erythrocytes that increases blood viscosity, causing it to sludge, or flow sluggishly.

front 34

Blood Doping

back 34

Practiced by some athletes competing in aerobic events, is artificially induced polycythemia. Some of the athlete's RBCs are drawn off and stored. The body quickly replaces these erythrocytes because removing blood triggers the erythropoietin mechanism. Then, when the stored blood is reinfused a few days before the athletic event, a temporary polycythemia results. The additional infusion should translate into increased oxygen-carrying capacity.

front 35

Leukocytes or White Blood Cells (WBCs)

back 35

the only formed elements that are complete cells, with nuclei and the usual organelles. Accounting for less that 1% of total blood volume. Critical for our defense against disease.

front 36

Diapedesis

back 36

White blood cells are able to slip out of the capillary blood vessels.

front 37

Amoeboid Motion

back 37

Once out of the bloodstream, leukocytes move through the tissue spaces by ______________ (the form flowing cytoplasmic extensions that move them along).

front 38

Positive Chemotaxis

back 38

By following the chemical trail of molecules released by damaged cells or other leukocytes, a phenomenon called _______________, they pinpoint areas of tissue damage and infection and gather there in large numbers to destroy foreign substances and dead cells.

front 39

Leukocytosis

back 39

A white blood cell count of over 11,000 cells/micrometer. This condition is a normal homeostatic response to an infection in the body.

front 40

Granulocytes

back 40

Neutrophils, eosinophils, and basophils, are all roughly spherical in shape. They are larger and much shorter lived (in most cases) than erythrocytes. They characteristically have lobed nuclei and their membrane-bound cytoplasmic granules stain quite specifically with Wright's stain. Functionally all are phagocytes to some degree.

front 41

Neutrophils

back 41

The most numerous white blood cells, account for 50-70% of the WBC population. They are about twice as large as erythrocytes. The cytoplasm contains very fine granules that are difficult to see. Because their granules take up both basic (blue) and acidic (red) dyes. Together, the two types of granules give the cytoplasm a lilac color.

front 42

Defensins

back 42

A potent "brew" of antimicrobial proteins.

front 43

Polymorphonu-clear Leukocytes (PMNs)

back 43

Neutrophil nuclei consist of three to six lobes. Because of this nuclear variablility, they are often called _______________.

front 44

Respiratory Burst

back 44

When a cell metabolize oxygen to produce potent germ-killer oxidizing substances such s bleach and hydrogen peroxide

front 45

Eosinophils

back 45

Account for 2-4% of all leukocytes and are approximately the size of neutrophils. Their nucleus usually resembles an old-fashioned telephone receiver-it has two lobes connected by a broad band of nuclear material. They lack an enzyme that specifically digests bacteria. They lead the counter-attack against parasitic worms, such as flatworms and roundworms that are too large to be phagocytized.

front 46

Basophils

back 46

The rarest WBCs, accounting for only .5-1% of leukocyte population. Their cytoplasm contains large, coarse, histamine-ontaining granules that have an affinit for the basic dyes and stain purplish-black.

front 47

Agranulocytes

back 47

Lymphocytes and monocytes, WBCs that lack visible cytoplasmic granules. Although similar to each other structurally, they are functionally distinct and unrelated cell types. Their nuclei are typically spherical or kidney shaped.

front 48

Lymphocytes

back 48

Account for 25% or more of the WBC population, are the second most numerous leukocytes in the blood. When stained, a typical lymphocyte has a large, dark-purple nucleus that occupies most of the cell volume. Large numbers of lymphocytes exist in the body, but relatively few (mostly the small lymphocytes) are found in the bloodstream.

front 49

T Lymphocytes (T cells)

back 49

function in the immune response by acting directly against virus-infected cells and tumor cells.

front 50

B Lymphocytes (B cells)

back 50

give rise to plasma cells, which produce antibodies (immunoglobulins) that are released to the blood.

front 51

Antibodies

back 51

Immunoglobulins

front 52

Monocytes

back 52

Account for 3-8% of WBCs. With an average diameter of 18 micrometers, they are the largest leukocytes. They have abundant pale-blue cytoplasm and a darkly staining purple nucleus, which is distinctively U or kidney shaped.

front 53

Macrophages

back 53

When circulating monocytes leave the bloodstream and enter the tissues, they differentiate into highly mobile _________ with prodigious appetites. Macrophages are actively phagocytic, and they are crucial in the body's defense against viruses, certain intracellular bacterial parasites, and chronic infections such as tuberculosis.

front 54

Leukopoiesis

back 54

Like erythropoiesis, _____________, or the productio of WBCs, is stimulated by chemical messengers. The

front 55

Interleukins
Colony-Stimulating Factors
CSFs

back 55

Chemical messengers that stimulate the production of WBCs. They can act either as paracrines or hormones, are glycoproteins that fall into two families of hematopoietic factors, ___________ and ____________, or ____. ________ are numbered, but but most _________ are named for the leukocyte population they stimulate.

front 56

Lymphoid Stem Cells

back 56

Produce lymphocytes

front 57

Myeloid Stem Cells

back 57

Give rise to all other formed elements.

front 58

Myeloblasts

back 58

Accumulate lysosomes, becoming promyelocytes.

front 59

Promyelocytes

back 59

Granulocyte precursor, developing from the myeloblast and developing into the myelocyte.

front 60

Myelocyte

back 60

The distinctive granules of each granulocyte type appear next in the ___________ stage and then cell division stops.

front 61

Band Cell

back 61

A cell undergoing granulopoiesis, derived from a metamyelocyte, and leading to a mature granulocyte

front 62

Monoblast and Promonocyte

back 62

Cells following the monocyte line pass through the __________________ stages before leaving the bone marrow.

front 63

T and B Lymphocyte Precursors

back 63

T and B lymphocytes are derived from __________________, which arise from the lymphoid stem cell.

front 64

Leukopenia

back 64

An abnormally low WBC count, commonly induced by drugs, particularly glucocorticoids and anticancer agents.

front 65

Platelets

back 65

Not cells in the strict sense. Small, disc shaped cell fragments. Essential for the clotting process.

front 66

Megakaryocytes

back 66

Platelets are cytoplasmic fragments of extraordinarily large cells called ____________.

front 67

Thrombopoietin

back 67

A hormone that regulates the formation of platelets.

front 68

Megakaryoblast

back 68

Precursor cell to a promegakaryocyte, which in turn becomes a megakaryocyte during haematopoiesis

front 69

Hemostasis

back 69

If a blood vessel wall breaks, a whole series of reactions is set in motion to accomplish ___________, which stops the bleeding. Its response is fast, localized, and carefully controlled.

front 70

Vascular Spasm

back 70

First step in hemostasis. Smooth muscle contracts causing vasoconstriction.

front 71

Prostacyclin

back 71

Intact endothelial cells release nitric oxide and a prostaglandin call ________.

front 72

Adenosine Diphosphate (ADP)

back 72

A potent aggregating agent that causes more platelets to stick to the area and release their contents.

front 73

Serotonin and Thromboxane A2

back 73

Messengers that enhance vascular spasm and platelet aggregation

front 74

Coagulation or Blood Clotting

back 74

Reinforces the platelet plug with fibrin threads that act as a "molecular glue" for the aggregated platelets.

front 75

Clotting factors or procoagulants

back 75

Blood is transformed from a liquid to a gel in a multistep process that involves a series of substances called _________________.

front 76

Intrinsic Pathway

back 76

Factors needed for clotting are present within the blood.

front 77

Extrinsic Pathway

back 77

Tissue factor it requires is outside of the blood.

front 78

(PF3) Platelet Factor 3

back 78

no data

front 79

Prothrombin Activator

back 79

Once factor X has been activated, it complexes with calcium ions, PF3, and factor V to form _______________. This is usually the slowest step of the blood clotting process, but once ______________ is present, the clot forms in 10-15 seconds.

front 80

Tissue Factor (TF) or Factor III

back 80

Triggered by exposing blood to a factor found in tissues underneath the damaged endothelium. This factor is called _______________________.

front 81

Prothrombin

back 81

Phase 2 of of coagulation: Prothrombin activator catalyzes the conversion of a plasma protein called ________ into the active enzyme thrombin.

front 82

Thrombin

back 82

An active enzyme. It catalyzes the transformation of the soluble clotting factor fibrinogen into fibrin.

front 83

Fibrinogen

back 83

A soluble clotting factor that is transformed into fibrin.

front 84

Fibrin

back 84

The _________ molecules then polymerize (join together) to form long, hair like, insoluble ________ strands. The ______ strands glue the platelets together and make a web that form the structural basis of the clot.

front 85

Factor XIII (Fibrin Stabilizing Factor)

back 85

A cross-linking enzyme that binds the fibrin strands tightly together, forming a fibrin mesh.

front 86

Anticoagulants

back 86

Factors that inhibit clotting. Whether or not blood clots depends on a delicate balance between clotting factors and ________________.

front 87

Clot Retraction

back 87

Within 30-60 minutes, a platelet-induced process called ____________ further stabilizes the blot. Platelets contain contractile proteins (actin and myosin), and they contract in much the same manner as smooth muscle cells.

front 88

Serum

back 88

As the platels contract, they pull on the surrounding fibrin strands, squeezing __________ (plasma minus the clotting proteins) from the mass, compacting the clot and drawing the ruptured edges of the blood vessel more closely together.

front 89

Platelet-derived growth factor (PDGF)

back 89

_______________ released by platelets stimulates smooth muscle cells and fibroblasts to divide and rebuild the vessel wall.

front 90

Fibrinolysis

back 90

Removes unneeded clots when healing has occurred. This cleanup detail is crucial because small clots form continually in vessels throughout the body. Without ____________, blood vessels would gradually become completely blocked.

front 91

Plasmin

back 91

The critical natural "clot buster" is a fibrin-digesting enzyme called ________.

front 92

Plasminogen

back 92

Plasmin is produced when the plasma protein ____________ is activated.

front 93

Tissue Plasminogen Activator (tPA)

back 93

The presence of a clot in and around the blood vessel causes the endothelial cells to secrete ____________.

front 94

Antithrombin III

back 94

A protein present in plama, quickly inactivates any thrombin not bound to fibrin.

front 95

Protein C

back 95

Antithrombin III and _____________, another protein produced in the liver, also inhibit the activity of other intrinsic pathway clotting factors.

front 96

Heparin

back 96

The natural anticoagulant contained in basophil and mast cell granules is also found on the surface of endothelial cells. It inhibits thrombin by enhancing the activity of antithrombin III. It also inhibits the intrinsic pathway.

front 97

Thromboembolic Disorders

back 97

Result from conditions that cause undesirable clot formation.

front 98

Bleeding Disorders

back 98

Arise from abnormalities that prevent normal clot formation.

front 99

Disseminated Intravascular Coagulation (DIC)

back 99

Has characteristics of both thromboembolic and bleeding disorders, involves both widespread clotting and severe bleeding.

front 100

Thrombus

back 100

A clot that develops and persists in an unbroken blood vessel.

front 101

Embolus

back 101

When thrombus breaks away from the vessel wall and floats freely in the bloodstream. This is usually not a problem until it encounters a blood vessel too narrow for it to pass through.

front 102

Embolism

back 102

When an embolus encounters a blood vessel too narrow for it to pass through it become an _____________, obstructing the vessel.

front 103

Aspirin

back 103

Used to prevent undesirable clotting. Antiprostaglandin drug that inhibits thrombaxane A2 formation (blocking platelet aggregation and platelet plug formation). May help with reduction in incidence of heart attack.

front 104

Warfarin (Coumadin)

back 104

Reduce the risk of stroke in those prone to atrial fibrillation, a condition in which blood pools in the heart. _____________ interferes with the action of vitamin K in the production of some clotting factors.

front 105

Thrombocytopenia

back 105

A condition in which the number of circulating platelets is deficient. It causes spontaneous bleeding from small blood vessels all over the body. Even normal movement leads to widespread hemorrhage, evidenced by many small purplish spots, called petechiae, on the skin.

front 106

Hemophilia

back 106

Several hereditary bleeding disorders that have similar signs and symptoms.

front 107

Factor VIII (Antihemophilic Factor)

back 107

Hemophilia A results from a deficiency of _______________. It accounts for 77% of the cases of hemophilia.

front 108

Whole Blood Transfusions

back 108

Routine when blood loss is rapid and substantial.

front 109

Packed Red Cells

back 109

IN all other cases of blood transfusion, infusions of _______________ (whole blood from which most of the plasma and leukocytes have been recoved) are preferred for restoring oxygen-carrying capacity.

front 110

Agglutinogens

back 110

RBC antigens that promote agglutinatin.

front 111

ABO Blood Groups

back 111

Based on the presence or absence of two agglutinogens, type A and type B.

front 112

Agglutinins

back 112

Unique to the ABO blood groups is the presence in the plasma of preformed antibodies called __________. They act against RBCs carrying ABO antigens that are not present on a persons own blood cells.

front 113

Rh Factor

back 113

There are 52 named Rh agglutinogens, each of which is called an _________. Only three of these, the C, D, and E antigens are fairly common.

front 114

Hemolytic Disease of the Newborn or Erythroblastosis Fetalis

back 114

Rh- women who carry Rh+ babies first pregnancy usually results in a healthy baby. If bleeding occurs as the placenta detaches from the uterus, the mother may be sensitized by her baby's Rh+ antigens that pass into her blood stream. If so, she will form anti-Rh antibodies unless treated with RhoGAM before or shortly after she has given birth. If the mother is not treated and becomes pregnant again with an Rh+ baby, her antibodies will cross through the placenta and destroy the baby's RBCs, producing a condition know as _____________.

front 115

Transfusion Reaction

back 115

When mismatched blood is infused, a _____________ occurs in which the recipient's plasma agglutinins attack the donor's red blood cells. (Note that the donor's plasma antibodies may also agglutinate the recipient's RBCs, but these antibodies are so diluted in the recipient's circulation that this does not usually present a problem.)

front 116

Universal Donor

back 116

Group 0 RBCs bear neither the A nor the B antigen, so theoretically group O is the _______________.

front 117

Universal Recipients

back 117

Since group AB plasma is devoid of antibodies to both A and B antigens, group AB people are theoretically _________ and can receive blood transfusions from any of the ABO groups.

front 118

Autologous Transfusions

back 118

The patient predonates his or her own blood, and it is stored and immediately available if needed during an operation.

front 119

Plasma Expanders

back 119

Purified human serum albumin, hetastarch, and dextran provide no benefits over much cheaper electrolyte solutions and are actually associated with significant complications of their own.

front 120

Differential White Blood Cell Count

back 120

Determines the relative proportions of individual leukocyte types and is a valuable diagnostic tool. For example, a high eosinophil count may indicate a parasitic infection or an allergic response somewhere in the body.

front 121

Prothrombin Time

back 121

Clinicians determine the _________________ to assess the ability of blood to clot when thrombocytopenia is suspected.

front 122

Platelet Count

back 122

Clinicians may do a ____________ when thrombocytopenia is suspected.

front 123

Complete Blood Count (CBC

back 123

Routine during a physical exam and before hospital admissions. Includes counts of the different types of formed elements, the hematocrit, measurements of hemoglobin content, and size of RBCs.

front 124

Hemoglobin F

back 124

The fetus forms a unique hemoglobin, _____________, that has a higher affinity for oxygen than does adult hemoglobin (hemoglobin A).