18 Questions
What time frame is considered normal for bleeding time?
1-3 minutes
Which neurotransmitter is involved in inducing blood vessel contraction or convulsion?
5-hydroxytryptamine (5-HT)
What process can turn a loose platelet thrombus into a compact platelet thrombus?
Ca2+ release and cytoskeleton movement
What is the role of activated platelets in hemostasis?
Supply lecithoid surface for blood clotting factor and involve in activating factor X and prothrombin
What is the first step in the process of hemostasis?
Vascular spasm
What is the shape of an activated platelet for hemostasis?
Biconvex
Which physiological factor induces thrombocyte aggregation in hemostasis?
Thrombin
What is the average cubage of a platelet?
$8 µm^3$
What is the normal concentration of platelets in the blood?
150,000 - 400,000 per μL
Which organelle is responsible for amplifying reaction to injury in platelets?
Alpha granules
What is the composition of the peripheral zone of platelets?
Site of platelet adhesion and aggregation
Which receptor in the peripheral zone of platelets serves as the receptor for vWF?
Gp1b
What is the function of the sol-gel zone in platelets?
For contraction and support
Where does thrombopoiesis occur?
Bone marrow
What is the role of the fibrinogen group in blood coagulation?
Completely consumed during coagulation
Which group of coagulation factors is not consumed during coagulation?
Contact group
What characterizes the primary platelet plug in secondary hemostasis?
Unstable and easily dislodged
Which of the following is NOT a characteristic of blood clotting enzymes?
All are synthesized by the liver with VitK
Test your knowledge of thrombocyte release and the physiological process of hemostasis with this quiz. Explore the release of various substances from dense bodies and α-granules, and learn about the normal bleeding time. Understand the process of hemostasis from vessel bleeding to automatic hemostasis.
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