Control and Co-ordination — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination4 Marks
Question
Resting potential of a nerve fibre.
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Answer
The neurons have a property of excitability.
The transmission of the nerve impulse along the long nerve fibre is a result of electrical changes across the neuronal membrane during conduction of an excitation.
The plasma membrane separates the outer $[$extra cellular fluid$]$ and inner solutions $[$intra cellular fluid/cytoplasm$]$ of different chemical compounds.
The external tissue fluid has both $Na^+$ and $K^+$
On the inside there is an excess of $K^+$ along with large amount of negatively charged protein molecules and nucleic acid.
This condition of a resting nerve is also called a polarised state and it is established by maintaining an excess of $Na^+$ on the outer side.
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