Primary Pharmacology // Drug Repurposing

Primary Pharmacology

Summary of Platelet aggregation (Primary hemostasis)

-Link to entire video lecture:

-Can be measured by Complete Blood Count (CBC)

2. Secondary Hemostasis (Concerns coagulation cascade)

Intrinsic Pathway 12–>11–>9–(8)–>10–>(5)–>2 (Prothrombin)–>1 (Fibrinogen)


Extrinsic Pathway (Requires Vitamin K)

-Intrinsic Pathway can be measured by PT (Prothrombin Time)

-Extrinsic Pathway can be measured by PTT/INR (Partial Thromboplastin Time/International Normalised Ratio)

What are platelets? [Not true cells but are circulating fragments of a cell]

-Platelets are small, non-nucleated, biconvex discs (1.5-3.5 microns in diameter)

-Normal lifespan is 7-10 days, made in bone marrow

-Forms plugs to occlude sites of vascular damage, promote clot formation by providing a surface for the activation of coagulation factors and secrete factors involved in vascular repair.

-Contains four granule types:

(a) Alpha granules: Contains host of adhesion molecules, coagulation factors and growth factors

(b) Dense granules: Very electron dense and contains serotonin

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