Initial bradycardia caused by intramuscular injection
of atropine is believed to be caused by:
A. Stimulation of medullary vagal centre
B. Stimulation of vagal ganglia
C. Blockade of M2 receptors on SA nodal cells
D. Blockade of muscarinic autoreceptors on
vagal nerve endings

1 Answer

Answer :

D. Blockade of muscarinic autoreceptors on
vagal nerve endings

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