Hemostasis Flashcards

1
Q

Where is thrombopoietin produced?

A

It is produced by the liver and to a lesser extent, the kidney.

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2
Q

What all is contained in the vesicles of a platelet?

A

ADP

Thromboxane A2

Fibrin stabilizing factor

Platelet derived growth factor

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3
Q

What is the function of cyclooxygenase 1?

A

Conversion of arachidonic acid into prostaglandins (like thromboxane A2)

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4
Q

What are the four steps of hemostasis?

A

Vascular spasm

Platelet plug

Blood clot

Repair

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5
Q

What three chemicals act as short term vasoconstrictors to assist with the vascular spasm phase of hemostasis?

A

Thromboxane A2

Platelet factor

Serotonin

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6
Q

What are the two steps for the formation of a platelet plug?

A
  • Collagen is exposed -

Step 1: Von Willebrand factor binds

Step 2: Platelet’s collagin receptor binds and is activated

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7
Q

What does thrombin do to help form a clot?

What does it do to get rid of a clot?

A

To form the clot: fibrinogen → fibrin

To get rid of the clot,

Protein C → Activated protein C

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8
Q

What is the function of protein C in clot removal?

A

It inactivates the tPA inhibitor

This allows tissue plasminogen activator (tPA) to activate plasminogen into plasmin.

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