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Antagonist binds with the same receptor as the agonist and inhibits its effect

receptor anatgonism

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  • A Carrier is involved
  • B It is against concentration gradient
  • C Energy is required
  • D All of the above
Explanation: Facilitated diffusion differs from active transport in that it does not require energy source and it carries the transport in the direction of electrochemical gradient.
  • A Passive diffusion
  • B Facilitated diffusion
  • C Active transport
  • D Pinocytosis
  • A Weak acids
  • B Strong acids
  • C Weak Bases
  • D None of the above
Explanation:
because of enhanced disassociation weak acids
are excreted faster in basic (not acidic) urine.
  • A Adrenergic α1 agonists
  • B Adrenergic α1 antagonists
  • C Adrenergic α2 antagonists
  • D Adrenergic α2 agonists
  • 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.

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