$P$ nerve fibers transmit impulses from tissues/organs to the $CNS$ and $Q$ nerve fibers transmit regulatory impulses from the $CNS$ to the concerned peripheral tissues/organs.
$\quad\quad\quad P\quad\quad\quad Q$

  • A
    Efferent nerve fibers $\quad\quad$ Efferent nerve fibers
  • B
    Afferent nerve fibers $\quad\quad$ Afferent nerve fibers
  • C
    Afferent nerve fibers $\quad\quad$ Efferent nerve fibers
  • D
    Efferent nerve fibers $\quad\quad$ Afferent nerve fibers

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