<prompt> Aspirin prolongs bleeding by inhibiting the synthesis of which of the following?Adenosine receptorsCyclic AMPProstacyclinThromboxane A2  <response>: Aspirin inactivates cyclo- oxygenase by irreversible acetylation of the enzyme and thereby inhibit the synthesis of thromboxane A2 even in low doses 75mgday. From medical pharmacology padmaja 4th edition page no 344 