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binding of Morphine and Naloxone to the Opioid receptors

competitive antagonism
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Try These Similar MCQs

  • A Heparin & Protamine
  • B Protamine & Zinc
  • C Heparin & Prothrombin
  • D All the above
Explanation: Chemical antagonism does not involve any receptors. Protamine is a positively charged protein at physiological pH and thus antagonizes the effects of Heparin which is negatively charged at physiological pH.
  • A Is more painful
  • B Produces faster response
  • C Is unsuitable for depot preparations
  • D Carries greater risk of anaphylactic reaction
  • A It produces less muscarinic side effects
  • B It is more potent orally
  • C It is longer acting
  • D It does not have any direct action on NM receptor
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