quiz 3.1 blood to heme Flashcards
occurs when the endothelium lining blood vessels is damaged or removed
thrombosis
first and intiial step in hemostasis of injured vessels
vasocon
3 phases shared by hemostasis and thrombosis
platelet aggre
fibrin mesh formation
dissolution
3 types of thrombi
white
red
fibrin deposits
phase wherein platelets bind to collagen at the site of vessel wall injury, form TXA2 and release ADP
platelet aggre
this binds to the paltelet aggregate making it more stable
fibrin mesh
a phase involving plasmin
dissolution
thrombus that is relatively poor in RBC, found in rapid blood flow vessels
white fibrin
thrombus found in vessels where blood is retarded or there is stasis with or without injury
red fibrin
fibrin found in capillaries or small vessels
fibrin deposits
types of coagulationf actors
zymogen cofactor fibrinogen transglutaminase regulatory and other proteins
in vitro, the intrinsic pathway can be activated by
negatively charged surfaces
common name factor 1
fibrinogen
common name factor 2
prothrombin
common name factor 3
tx factor
common name factor 4
calcium
common name factor 5
proaccelerin
common name factor 7
proconvertin
factors under ex. pathway
7
3
factors under itnrinsic
12
11
9
8
PK
HMWK
first common factor for ex and int pathways
10
the ext. pathway is initiated at the site of ___ with the exposure of _____
tx injury
tx factor
TF acts as a cofactor for ____, enhacning its enzymatic activity
7
activation of factor 10 requires what complex
extrinsic tenase complex (Ca-TF-fac 7a)
TF nad factor 7a activates what shit in the intrinsic pathway
factor 9
major physiologic inhibitor of coag
TF pahway inhibitor (TFPI)
how does TFPI inhibit coag
TFPI + factor 10a inhibits TF-7a complex
links the intrinsic and extrinsic pathway
factor 10
main action of thrombin
activates fibrinogen
a highly specific transglutaminase that is activated by fibrinogen
factor 8a
important natural inhibitor of coagulation, genetic deficiency of this protein can result in thrombosis
antithrombin
the endogenous activity of antithrombin is greatly potentiated by the ____________
presence of sulfated GAGs (heparans)
the action of heparin can be strongly antagonized by cationic polypeps like
protamine
the regulatory mechanism of thrombin is attirubted to its acility to combine with
thrombomodulin
a genetic deficiecny of either ___ or ____ can cause venous thrombosis
protein C or S
px with ______ have a increased risk for venous thrombosis
factor 5 Leiden
why higher risk sa venous thrombosis ang may Leiden
Leiden cannot be inactivated by APC
APC degrades
factors 5a and 8a
vit-K dependent facotrs
2 7 9 10 protein C and S
why vit-K dependent ang 2 7 9 10
they need vit-K dependent y-carboxylation of glut resideues to function
what inhibits the y-carboxylation in vit-K dependents
warfarin
warfarin inhibits what specifically
y-carboxylation
during synth of factors, vit-K is important in modification and formation of
gamma-carboxyglutamate
coumarin or heparin: which is instantaneous
heparin
coumarin or heparinL which takes days to take effect
coumarin
a predicatable administration of inihibitors of thrombin
oral
most common hemophilia
hem A
hemophilia A is deficiency of
factor 8
hempphilia B is deficiecny of
factor 9
most common genetic bleeding disorder
von Willebrand factor
a large multimeric glycoprotein that stabilizes factor 8
von Willebrand factor
functions of von Willebrad
stabilize factor 8
promotes platelet adhesion
fibrin clots are dissolved by
plasmin
activates plasminogen
tx plasminogen activator
the fast-acting inhibitor of plasmin
a2-antiplasmin
activators of plasminogen all cleave what
arg-val bond
the carboxypeptidase that can inhibit fibrinolysis by removing the terminal lysines from fibrin
thrombin activatable fibrinolysis inhibitor (TAFIa)
the second activator of plasminogen
urokinase
main action of urokinase
degrades ECMatrix
t-PA is marketed as _____ is produced by recombinant DNA methods
alteplase
t-PA or streptokinase: which is selective
t-PA
three steps in hemstatic plugs by paltelet
adhesion
secretion
aggregation
platelets adhere to ____ via _____
collagen
GPIa-IIa
GPIb-IX-V
the binding of GPib-IX-V is mediated via
von Willebrand
granules found in and released by platelet
dense and alpha
most potent activator of platelet and initiator of activation
thrombin
the further events leading to platelet activation upon binding of PAR-1 and 4 are examples of
outside0in transmembrane signaling
signaling wherein chemical messenger outside the cell generates effector molecules inside the cell
outside-in transmembrane signaling
phospholipase Ca hydrolyzed PIP2 to form what effectors molecules
IP3
DAG
cytosolic phospholipase A2 liberates arachidonic acid to form
TXA2
TXA2 promotes or inhibits platelet aggreg?
promotes
potent inhibitor of platelet aggregation produced by endothelial cells
prostacyclin
action of prostacyclin is via
cAMP formation > decreasing calcium
roles of endothelial cells in inhibiting platelet activities
ADPase
PGI2
heparan sulfate
plasminogen activators
an antiplatelet drug
aspirin
how does aspirin inhibit paltelets
inhibits production of thromboxane A2/COX1
full name of aspirin
acetylsalicylate
a potent aggregator of platelets and vasocon
TXA2
antiplatelet drugs
clopidogREL
prasugREL
ticagRELor
overall test for paltelet and vessel wall function
skin bleeding time
in vitro test of platelet-related hemostasis
closure time
a measure of the extrinsic pathway
PT
a measure of the intrinsic pathway
aPTT
used to monitor heparin therapy
PTT
used to monitor warfarin therapy
PT
“circulating tissue”
blood
fluid in an uncoagulated bllod
plasma
fluid in a coagulated blood
serum
blood comprises ___ of the total body weight
7-8%
normal blood pH
7.35-7.45
normal volume of blood
5-6L in M
4-5l IN Fe
normal sp.gr. of blood
1.035-1.075
the ability of stem cells to generate specialized cell types
potency
a stem cell that is capable of producing all the cells in an organism
totipotent
a stem cell that produce only cells of a closely related family
pluripotent
a stem cell that produce only one type of cell
unipotent
embryonic or adult stem cells: which is limited in capability to differentitate
adult
common lymphoid progenitor gives rise to
B cells
T cells
NK cells
plasmacytoid dendritic cells
common myeloid progenitor gives rise to
monocytoid dendritic cells
granulocyte-monocyte progenitor
megakaryocte-erythroid progenitor
cytokine that plays an important role in the proliferation of hematopoietic stem cells and some of their progeny
stem cell factors
glycoprotein imporatnt in regulating the rpoduction of platelets
thrombopoietin
cytokines produced by leukocytes that regulates various aspects of hematopoiesis
interleukins
hemoglobin comprises ___ of RBCs
33%
normal RBC count
- 6M in Fe
5. 2M in M
RBCs that still contain RNA of the ribosomes and elements of the ER is called
retics
erythropoiesis uses what
erythropoietin
IL-3
thrombopoietin
EPO is synthesized mainly by the ___ and released in response to ___
kidney
hypoxia
RBCs are dependent on ____ to generate ATP
glycolysis (anaerobic)
_______ is a variant of hgb that cannot transport oxygen
methemoglobin
_____ reduces the ferric of methemoglobin to ferrous restoring its function
cytochrome b5 reductase
RBCs depend on what 2 ways for production of energy
Embden-Meyerhoff (anaerobic)
HMP shunt
3 important products of anaerobic glycosis
NADH
ATP
2,3-DPB
the most important product of PPP/HMP
NADPH
principal determinant of shunt flow in the PPP is
NADP-NADPH ratio
H2O2 can be detoxified by the most active enzyme in the RBCs
catalase
the protein involved in the facilitated diffusion of glucose
GLUT1