Understanding Platelet Activation and Antiplatelet Drugs

What is the primary consequence of atherosclerotic plaque rupture in the coronary artery?

• Deep vein thrombosis

• Pulmonary embolism

• Myocardial infarction

• Stroke

Which molecule is known to inhibit platelet activation by increasing cGMP levels?

• Prostacyclin

• Nitric oxide

• Thromboxane A2

• Serotonin

Which receptor is primarily activated by von-Willebrand factor on damaged collagen?

• GPVI

• GPIb-IX-V

• Integrin alpha 2 beta 1

• Integrin alpha 3 beta 2

What is the role of phospholipase C in platelet activation?

• Activates protein kinase A

• Increases cAMP levels

• Inhibits thromboxane A2 production

• Converts PIP2 to IP3 and DAG

Which molecule is critical to aspirin's efficacy as an antiplatelet agent?

• Nitric oxide

• Serotonin

• Prostacyclin

• Thromboxane A2

What is released from platelets during degranulation that activates GPCRs?

• Nitric oxide

• ADP

• cAMP

• GTP

Which receptor is activated by ADP and reduces cAMP production?

• P2Y1

• P2Y12

• PAR1

• 5-HT2a

What is the effect of reduced PKA activity on platelet activation?

• Increases platelet inhibition

• Decreases thromboxane A2 production

• Decreases platelet reactivity

• Increases platelet reactivity

Which receptor is involved in the Gαq signaling cascade that increases platelet reactivity?

• IPR

• 5-HT2a

• P2Y12

• GPIb-IX-V

What is the primary function of fibrin in thrombus formation?

• Inhibits platelet activation

• Acts as a glue for platelet aggregation

• Reduces blood flow

• Activates protein kinase C