NUR 612 CHAPTER 22-24 |COMPLETE STUDY GUIDE WITH
100% ACCURATE QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
What is hemostasis? Answer: A tightly regulated process that maintains blood in a fluid state
within intact vessels while allowing rapid clot formation when vascular injury occurs.
What are the four phases of hemostasis? Answer: 1. Vascular Spasm 2. Primary Hemostasis 3.
Secondary Hemostasis 4. Fibrinolysis
What occurs during the vascular spasm phase? Answer: Vasoconstriction occurs as an
immediate response to vessel injury, reducing blood flow and pressure at the injury site.
What role does endothelin play in hemostasis? Answer: Endothelin is released by damaged
endothelial cells and is one of the body's most potent vasoconstrictors.
What is primary hemostasis? Answer: The formation of a temporary platelet plug at the site of
vascular injury.
What is the function of von Willebrand factor (vWF)? Answer: vWF binds exposed collagen and
acts as a bridge between collagen and platelet GPIb receptors, facilitating platelet adhesion.
What happens during platelet activation? Answer: Platelets change shape and release
substances like ADP, thromboxane A₂, and serotonin, promoting further platelet recruitment
and vasoconstriction.
What is the result of platelet aggregation? Answer: Activated platelets express GPIIb/IIIa
receptors, allowing fibrinogen to bridge platelets together, forming a temporary platelet plug.
What is secondary hemostasis? Answer: The stabilization of the platelet plug by forming fibrin
through the coagulation cascade.
What initiates the extrinsic pathway of coagulation? Answer: Tissue injury releases tissue factor
(Factor III), which combines with Factor VII to activate Factor X.
What is the role of thrombin in coagulation? Answer: Thrombin converts fibrinogen to fibrin,
creates a clot meshwork, activates platelets, and amplifies coagulation.
What is fibrinolysis? Answer: The process of removing a clot after healing, involving the
conversion of plasminogen to plasmin, which digests fibrin.
1
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, What does an elevated D-dimer indicate? Answer: Recent fibrin formation and breakdown,
often seen in conditions like DVT, PE, and major trauma.
What is thrombocytopenia? Answer: A condition characterized by a platelet count below
150,000/μL, increasing the risk of bleeding.
What are common causes of thrombocytopenia? Answer: 1. Decreased platelet production
(e.g., aplastic anemia) 2. Increased platelet destruction (e.g., ITP) 3. Platelet sequestration (e.g.,
splenomegaly).
What are classic clinical manifestations of thrombocytopenia? Answer: Mucocutaneous
bleeding, petechiae, purpura, ecchymoses, epistaxis, gingival bleeding, and menorrhagia.
What laboratory findings are expected in thrombocytopenia? Answer: Low platelet count,
normal PT, and normal aPTT.
What is the significance of antithrombin III? Answer: It inhibits thrombin and several clotting
factors, preventing inappropriate clotting.
What role do Protein C and Protein S play in hemostasis? Answer: They are vitamin K-
dependent anticoagulants that inactivate Factors Va and VIIIa, preventing excessive clotting.
What is Virchow's Triad? Answer: A set of three factors that contribute to thrombosis:
endothelial injury, abnormal blood flow, and hypercoagulability.
What are the clinical distinctions between platelet disorders and coagulation factor disorders?
Answer: Platelet disorders cause mucosal bleeding (e.g., nosebleeds), while coagulation factor
disorders lead to deep tissue bleeding (e.g., hemarthrosis).
What is the role of healthy endothelium in hemostasis? Answer: It produces substances like
prostacyclin and nitric oxide that inhibit platelet activation and maintain blood fluidity.
What is the clinical correlation of heparin? Answer: Heparin increases antithrombin activity,
enhancing its ability to inhibit clotting factors.
What are common causes of excessive bleeding? Answer: Causes include platelet disorders,
coagulation factor deficiencies, and vessel abnormalities.
What is the importance of calcium in hemostasis? Answer: Calcium is necessary for various
coagulation reactions during the hemostatic process.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
100% ACCURATE QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
What is hemostasis? Answer: A tightly regulated process that maintains blood in a fluid state
within intact vessels while allowing rapid clot formation when vascular injury occurs.
What are the four phases of hemostasis? Answer: 1. Vascular Spasm 2. Primary Hemostasis 3.
Secondary Hemostasis 4. Fibrinolysis
What occurs during the vascular spasm phase? Answer: Vasoconstriction occurs as an
immediate response to vessel injury, reducing blood flow and pressure at the injury site.
What role does endothelin play in hemostasis? Answer: Endothelin is released by damaged
endothelial cells and is one of the body's most potent vasoconstrictors.
What is primary hemostasis? Answer: The formation of a temporary platelet plug at the site of
vascular injury.
What is the function of von Willebrand factor (vWF)? Answer: vWF binds exposed collagen and
acts as a bridge between collagen and platelet GPIb receptors, facilitating platelet adhesion.
What happens during platelet activation? Answer: Platelets change shape and release
substances like ADP, thromboxane A₂, and serotonin, promoting further platelet recruitment
and vasoconstriction.
What is the result of platelet aggregation? Answer: Activated platelets express GPIIb/IIIa
receptors, allowing fibrinogen to bridge platelets together, forming a temporary platelet plug.
What is secondary hemostasis? Answer: The stabilization of the platelet plug by forming fibrin
through the coagulation cascade.
What initiates the extrinsic pathway of coagulation? Answer: Tissue injury releases tissue factor
(Factor III), which combines with Factor VII to activate Factor X.
What is the role of thrombin in coagulation? Answer: Thrombin converts fibrinogen to fibrin,
creates a clot meshwork, activates platelets, and amplifies coagulation.
What is fibrinolysis? Answer: The process of removing a clot after healing, involving the
conversion of plasminogen to plasmin, which digests fibrin.
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, What does an elevated D-dimer indicate? Answer: Recent fibrin formation and breakdown,
often seen in conditions like DVT, PE, and major trauma.
What is thrombocytopenia? Answer: A condition characterized by a platelet count below
150,000/μL, increasing the risk of bleeding.
What are common causes of thrombocytopenia? Answer: 1. Decreased platelet production
(e.g., aplastic anemia) 2. Increased platelet destruction (e.g., ITP) 3. Platelet sequestration (e.g.,
splenomegaly).
What are classic clinical manifestations of thrombocytopenia? Answer: Mucocutaneous
bleeding, petechiae, purpura, ecchymoses, epistaxis, gingival bleeding, and menorrhagia.
What laboratory findings are expected in thrombocytopenia? Answer: Low platelet count,
normal PT, and normal aPTT.
What is the significance of antithrombin III? Answer: It inhibits thrombin and several clotting
factors, preventing inappropriate clotting.
What role do Protein C and Protein S play in hemostasis? Answer: They are vitamin K-
dependent anticoagulants that inactivate Factors Va and VIIIa, preventing excessive clotting.
What is Virchow's Triad? Answer: A set of three factors that contribute to thrombosis:
endothelial injury, abnormal blood flow, and hypercoagulability.
What are the clinical distinctions between platelet disorders and coagulation factor disorders?
Answer: Platelet disorders cause mucosal bleeding (e.g., nosebleeds), while coagulation factor
disorders lead to deep tissue bleeding (e.g., hemarthrosis).
What is the role of healthy endothelium in hemostasis? Answer: It produces substances like
prostacyclin and nitric oxide that inhibit platelet activation and maintain blood fluidity.
What is the clinical correlation of heparin? Answer: Heparin increases antithrombin activity,
enhancing its ability to inhibit clotting factors.
What are common causes of excessive bleeding? Answer: Causes include platelet disorders,
coagulation factor deficiencies, and vessel abnormalities.
What is the importance of calcium in hemostasis? Answer: Calcium is necessary for various
coagulation reactions during the hemostatic process.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
