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Erythrocytes
Morrow 1/14/11 lecture
90
Histology
Undergraduate 4
01/17/2011

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Term
hemopoiesis
Definition
process by which mature blood cells develop from precursor cells
Term
vascular sinuses of bone marrow of certain bones esp. flat bones of skull, ribs, sternum, vertebrae, pelvis and some long bones
Definition
location of hematopoiesis in adult humans
Term
2.5 billion
Definition
# RBC put out per day
Term
blood islands in yolk sac
Definition
where hematopoiesis occurs in fetus 1st (during first trimester)
Term
liver and lymphatic tissue
Definition
where hematopoeisis occurs in second trimester of fetus
Term
bone marrow
Definition
where hematopoeisis occurs in last month of pregnancy
Term
restricted primarily to marrow cavities
Definition
where hematopoeisis occurs at birth
Term
decrease
Definition
what happens to number of active hematopoeisis sites with age
Term
red marrow
Definition
type of marrow that is active, contains large number of RBC's
Term
yellow/fatty marrow
Definition
inactive bone marrow, more in adults
Term
blood
Definition
specialized CT in fluid extracellular matrix (plasma)
Term
blood
Definition
primary vehicle for transport of nutrients, O2, CO2, waste products, and hormones
also functions in thermo regulation and homeostasis
Term
5 liters
Definition
average volume of blood in adults
Term
plasma
Definition
liquid, extracellular matrix, ~55% of blood volume
Term
91-92%, 1-2%, 7-8%
Definition
percentages of contents of blood(plasma?) ____% water, ____% electrolytes(Na, Ca, K, HCO3), ____% protein
Term
serum
Definition
plasma without clotting factors
Term
plasma proteins
Definition
albumin, globulins, fibrinogens
Term
albumin
Definition
bulk of plasma proteins
Term
liver
Definition
location of albumin synthesis
Term
albumin
Definition
function as transport protein for insoluble metabolites (ex: fatty acids)
Term
albumin
Definition
responsible for maintaining colloid osmotic pressure in blood vessels
Term
globulins
Definition
large molecules, used as transport proteins for lipids and heavy metal ions
Term
immunoglobulins
Definition
largest fraction of globulins, aka antibodies
Term
plasma cells
Definition
location of antibody/immunoglobulin synthesis
Term
fibrinogens
Definition
largest plasma proteins
Term
fibrin
Definition
polymer of fibrinogen that forms during clotting
Term
liver
Definition
location of fibrinogen synthesis
Term
prothrombin
Definition
cleaved to thrombin to catalyze fibrinogen to become fibrin
Term
formed elements
Definition
RBC's, WBC's, platelets
Term
bone marrow
Definition
where formed elements are made via hematopoeisis
Term
hematocrit, 45, 42
Definition
volume of RBC's ___% in males, ____% in females
Term
PCV, packed cell volume
Definition
same as hematocrit (+/- buffy coat depending on source)
Term
buffy coat
Definition
WBC's and platelets (1-2%)
Term
blood smear
Definition
drop of blood smeared, air dried, stained with modified Romanovsky method (ex: Wright Giemsa)
Term
Romanovsky method
Definition
stain for blood smears
Term
6-8 micrometers
Definition
diameter of a RBC, used as a reference to measure other things
Term
biconcave disk
Definition
shape of RBC's that allows deformability and resiliency, also increase surface area for gas exchange
Term
spectrin
Definition
primary structural protein in RBC's
Term
spectrin
Definition
binds to inner surface of RBS plasma membrane
Term
3-4 micro meters
Definition
diameter of a capillary
Term
hemoglobin
Definition
iron containing pigment involved in O2 and CO2 transport in RBC's
Term
4
Definition
Hemoglobin has __ # polypeptide chains with __ # Fe containing heme groups
Term
several hundred thousand
Definition
number of Hb molecules which transport O2 in RBC's
Term
anemia
Definition
results from decreased iron or blood loss
Term
sickle cell anemia
Definition
disease resulting from a single AA substitution (Valine for Glutamic Acid) causing change in structure of Hb molecule
Term
position 6 of beta globulin chain
Definition
where AA is substituted in sickle cell anemia
Term
sickle cells
Definition
causes damage to endothelial cells of capillary walls due to rough edges, more fragile, easily damaged
Term
enucleated & organelles degenerate
Definition
what happens to RBC's b4 they are released into blood stream
Term
Howell-Jolly Bodies
Definition
occasional basophillic nuclear remnants visible within cytoplasm of RBC's
Term
reticulocyte
Definition
immature RBC's with stippled cytoplasm, still have some rRNA. Slightly larger than mature RBC's
Term
erythropoeisis
Definition
production of RBC's
Term
decrease, increase
Definition
trends in RBC production cell size ___, loss of nucleus and organelles, ____ in Hb
Term
reticulocytosis
Definition
increased number of reticulocytes in circulation associated with chronic blood loss, or hemlytic anemia (left shift)
Term
left shift
Definition
on a scale of RBC maturity with most mature to the right and least mature to the left, what happens with chronic blood loss/hemolytic anemia
Term
microcytic/hypochromic
Definition
with iron deficient anemia, RBC's are small ( _____) and pale staining (_______)
Term
contents of a mature RBC
Definition
outer cell membrane with cytoplasm, Hb, and a few enzymes. No mitochondria
Term
120 days
Definition
life span of mature RBC
Term
anaerobic glycolysis
Definition
the only way RBC's can make energy
Term
liver and spleen
Definition
remove senescent(old) RBC's from circulation
Term
thrombocytes
Definition
another name for platelets
Term
thrombocytes/platelets
Definition
small non-nucleated cells containing few organelles
Term
megakaryocytes
Definition
large polyploid cells in bone marrow with single multi-lobed nucleus
Term
megakaryocytes in bone marrow
Definition
where/what platelets come from
Term
demarcation channels
Definition
pleated areas in the cytoplasm of megakaryocytes where platelets tear off.
Term
8-12 days
Definition
lifespan of human platelets
Term
platelets
Definition
function in blood clotting, form physical plugs at the site of vascular damage
Term
coagulation
Definition
result of cascade interaction between plasma proteins and coagulation factors

occurs only if endothelial lining of vessel is injured
Term
extrinsic pathway
Definition
faster pathway of coagulation
Term
intrinsic pathway
Definition
slower pathway of coagulation because it requires numerous clotting factors (von Willebrand's, factor VIII) and longer cascade reaction
Term
extrinsic pathway
Definition
initiated by release of tissue thromboplastin as a result of tissue damage
Term
intrinsic pathway
Definition
initiated by exposure of collagen
Term
Factor 12 -> factor 11 -> factor 9 -> (with help of factor 8)
Definition
intrinsic pathway of coagulation cascade to factor X
Term
factor 7
Definition
extrinsic pathway of coagulation cascade to factor X
Term
10-> 5 -> 2 (prothrombin to thrombin) -> 1 (fibrinogen)
Definition
coagulation cascadde from factor X onward
Term
when wall of blood vessel breaks, tissue injury results
Definition
when coagulation occurs
Term
collagen
Definition
what platelets mechanically adhere to
Term
seratonin
Definition
potent vasoconstrictor-constricts sm muscle in damaged vessel to minimize blood loss
Term
common pathway
Definition
point where factor X is activated in coagulation cascade
Term
common pathway
Definition
results in conversion of prothrombin to thrombin, which converts soluble fibrinogen to insoluble fibrin
Term
common pathway
Definition
results in conversion of prothrombin to thrombin, which converts soluble fibrinogen to insoluble fibrin
Term
fibrin
Definition
net that forms and traps platelets and RBC's
Term
stops clotting
Definition
exhaustion of fibrinogen and removal of thrombin from blood during conversion of fibrinogen to fibrin
Term
antithrombin 3 and heparin
Definition
anticoagulants
Term
heart attack, stroke, disseminated intervascular coagulation (DIC)
Definition
result of inappropriate clot formation
Term
hemophilia
Definition
deficiency of clotting factors, so blood can't clot
Term
intrinsic
Definition
hemphilia is due to a defect in (intrinsic or extrinsic) pathway
Term
hemophilia A
Definition
deficiency in clotting factor 8
Term
hemophilia B
Definition
deficiency in clotting factor 9
Term
hemophilia C
Definition
deficiency in clotting factor 11
Term
von willebrand's disease
Definition
deficiency in von willebrand's clotting factor
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