In $P$,the membranes of pre-synaptic and post-synaptic neurons are in very close proximity,whereas in $Q$,there is a space between the membranes of pre-synaptic and post-synaptic neurons.
$\quad\quad\quad P\quad\quad\quad Q$

  • A
    Chemical synapse $\quad$ Chemical synapse
  • B
    Chemical synapse $\quad$ Electrical synapse
  • C
    Electrical synapse $\quad$ Electrical synapse
  • D
    Electrical synapse $\quad$ Chemical synapse

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