APII Ch. 19 Study Guide

which type of specialized tissue is blood?

fluid connective tissue

what two components make up blood?

plasma and formed elements

what is the main component of plasma?

water

which formed element is the most abundant in blood?

red blood cells

defne hematocrit

the percentage of red blood cells within a sample of whole blood

what occurs during hematopoiesis?

formed elements are produced

list the three major plasma proteins in plasma

albumins, fibrinogens, and globulins

list the three types of formed elements (know their abbreviations)

red blood cells (RBCs), white blood cells (WBCs), and platelets

which organ synthesizes and releases 90% of plasma proteins?

liver

what are erythrocytes?

red blood cells

why are RBCs red in color?

because they contain the red pigment hemoglobin

what two gases are transported by hemoglobin?

oxygen and carbon dioxide

which vein, located superior to the olecranon, is commonly used for venipuncture?

median cubital vein

for what purpose would an arterial puncture be used?

for blood gas analysis, an indicator of lung function

human RBCs do not contain organelles. what cellular processes are affected by this?

cannot divide or synthesize structural proteins or enzymes, cannot repair themselves, obtain the energy they need through the anaerobic metabolism of glucose that is absorbed from the surrounding plasma

if every protein chain of hemoglobin has a heme associated with it, how many heme molecules and iron molecules are contained in one molecule of hemoglobin?

4 heme molecules and 4 iron molecules

what is oxyhemoglobin? what is deoxyhemoglobin?

oxyhemoglobin: (HbO2) each heme unit holds an iron in such a way that the iron can interact with an oxygen molecule; deoxyhemoglobin: a hemoglobin molecule whose iron is not bound to oxygen

compare oxygen binding capacities of adult vs fetal hemoglobin

fetal hemoglobin binds oxygen more readily than adult hemoglobin

what is carbaminohemoglobin?

formed when the alpha and beta chains of hemoglobin then bind to carbon dioxide

what is anemia?

a condition when the hematocrit is low or the Hb content of RBCs is reduced

what is erythropoiesis and where does it occur?

the formation of RBCs and only in red bone marrow (myeloid tissue)

which immature blood cell, accounting for less than 1% of the RBC population, is found in the blood?

reticulocyte

which hormone directly stimulates erythropoiesis?

erythropoietin

what is hypoxia?

a low oxygen level in tissues

what is the intrinsic factor and what is its function? where is it produced?

to absorb vitamin B12; produced in the stomach

what is hemolysis?

the rupture of RBCs

define hemoglobinuria and hematuria

hemoglobinuria: when abnormally large numbers of red blood cells break down in the bloodstream, urine may turn red or brown; hematuria: the presence of intact RBCs in urine

what is jaundice? what molecule causes the yellowing of the eyes and skin?

the combination of yellow skin and eyes caused by bilirubin

what is iron-deficiency anemia?

results from a lack of iron in the diet or from problems with iron absorption

which three of the greater than 50 blood antigens are most important when blood typing?

A, B, and Rh (or D)

type A blood has __ surface antigens and _ antibodies.

A, B

type B blood has ___ surface antigens and ___ antibodies.

B, A

type AB blood has ___ surface antigens and ___ antibodies.

both A and B, neither A nor B

type O blood has ___ surface antigens and ___ antibodies.

neither A nor B, both A and B

if type B blood is mistakenly given to a person with type A, what will specifically occur in a stepwise fashion?

surface antigens, opposing antibodies, agglutination (clumping), and hemolysis

what occurs to RBC if there is a transfusion reaction?

agglutinate and may also hemolyze

what is cross match testing used for?

to avoid cross-reactions

in emergency situations, which blood type is given because it is considered the “universal donor”?

type O

what is the scientific name for hemolytic disease of the newborn (HDN)?

erythroblastosis fetalis

HDN occurs when a Rh-___ mother has a second or subsequent pregnancy with a Rh-___ fetus.

negative, positive

why doesn’t HDN usually occur during a first pregnancy of an Rh- mother and Rh+ fetus?

very few fetal cells enter the maternal bloodstream then, and thus the female’s immune system is not stimulated to produce anti-Rh antibodies

what drug is administered to prevent an Rh- mother from being sensitized to an Rh+ baby’s antigen during the first pregnancy?

Rh immunoglobulin (RhoGAM)

what is diapedesis (also known as emigration)?

after interaction with endothelial cells, the activated WBCs squeeze between adjacent endothelial cells and enter the surrounding tissue

what is positive chemotaxis?

a characteristic in which all WBCs are attracted to specific chemical stimuli

what are the two groups of white blood cells (WBCs) based on their appearance after staining?

granulocytes and agranulocytes

list three types of WBC granulocytes; list two types of agranulocytes

granulocytes: neutrophils, eosinophils, and basophils; agranulocytes: monocytes and lymphocytes

which four types of WBCs are part of the body’s non-specific defenses?

neutrophils, eosinophils, basophils, and monocytes

which three types of WBCs are capable of phagocytosis?

neutrophils, monocytes, and macrophages

what is a respiratory burst? what two chemicals are released after a respiratory burst occurs?

when a neutrophil encounters a bacterium, it engulfs the invader, and the metabolic rate of the neutrophil increases dramatically; hydrogen peroxide and superoxide anions

what two toxic compounds are released by eosinophils?

nitric oxide and cytotoxic enzymes

which two conditions will cause an increased number of eosinophils?

parasitic infections and allergic reactions

what two molecules are found in basophil granules?

histamine and heparin

what are monocytes called after they enter the tissues?

macrophages

what type of adaptive immunity is T lymphocyte (T cell) related?

cell-mediated immunity

what type of adaptive immunity is B lymphocyte (B cell) related?

humoral immunity

what are plasma cells and what do they secrete?

differential activated B cells that secrete antibodies

which cells carry out immune surveillance and are important in preventing cancer?

natural killer cells (NK cells)

define leukopenia and leukocytosis

leukopenia: indicates inadequate numbers of WBCs; leukocytosis: refers to excessive numbers of WBCs

what is the difference between leukopoiesis and lymphocytopoiesis?

leukopoiesis: the process of WBC production; lymphocytopoiesis: the process of lymphocyte production

what is the scientific name for platelets?

thrombocytes

what is the major role of platelets?

the vascular clotting system

what are megakaryocytes?

enormous cells with large nuclei

what is hemostasis?

the stopping of bleeding

what enzyme converts soluble fibrinogen to insoluble fibrin?

thrombin

which ion and which vitamin affect almost every aspect of the clotting process?

calcium ions and vitamin K

what is fibrinolysis?

a process in which the clot gradually dissolves

what is thrombocytopenia?

a condition in which the platelet count is too low

what is hemophilia?

an inherited bleeding disorder in which the blood does not clot properly