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Assertion (A): Speed of nerve impulse is faster on medullated nerve fibres, than nonmedullated nerve
\( \mathrm{P} \)
fibres.
W
Reason (R): In medullated nerve fibres nerve impulses are conducted in a saltatory manner.
(1) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \)
(2) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true but \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \)
(3) If \( \mathrm{A} \) is true but \( \mathrm{R} \) is false
(4) If \( \mathrm{A} \) is false but \( \mathrm{R} \) is true
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