<prompt> Low doses of aspirin used in myocardial infarction act by -Inhibiting thromboxane synthetaseInhibit cyclooxygenaseReleasing EDRFHigh protein binding activity  <response>: Ans. is b i.e., Inhibit cyclooxygenase Aspirin in low doses --- inhibits synthesis of TXA2 by inhibiting the enzyme cycloxygenase So that immediate precursor prostaglandins of TXA2 are not synthesized. o Ticlopidine, clopidogrel -4 they block ADP mediated cAMP inactivation. 