Control and Co-ordination — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination4 Marks
Question
Velocity of nerve impulse.
✓
Answer
The rate of transmission of impulse is higher in long and thick nerves.
It is higher in warm blooded animals [homeotherms] than in cold blooded animal [poikilotherms].
The velocity of transmission is higher in voluntary fibres (100- 120 m/second in man) as opposed to autonomic or involuntary nerves (10-20 m/second).
It is faster in medullated nerve fibre [up to 150 m/s], as the impulse has to jump from one node of Ranvier to the next as compared with non-medullated nerve fibre [10-25 m/s]
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