Question

Which option is correct for the correctly matched groups for the column I, column II and column III
$\begin{array}{ccc}ColumnI& ColumnII& ColumnIII\\ A.Restingmembranepotential& \left(i\right)N{A}^{+}channelgetopen& \left(p\right)N{a}^{+}and{K}^{+}pumpsareresponsibleforit\\ B.Actionpotential& \left(ii\right)N{a}^{+}channelisclosed& \left(q\right)Lastforveryshorttime\\ C.Depolarisation& \left(iii\right)N{a}^{+}ionsaremoreonoutersideofmembrane& \left(r\right)K^{+}ionsmoveonouterside\\ D.Repolarisation& \left(iv\right)N{a}^{+}ionsaremoreoninnersideofmembrane& \left(s\right)Positivechargeoninnersideofmembrane\end{array}$

• A. (A - iii - p) (B - iv - q) (C - i - s) (D - ii - r)
• B. (A - ii - s) (B - i - r) (C - iii - p) (D - iv - q)
• C. (A - iv - q) (B - iii - p) (C - i - p) (D - i - s)
• D. (A - iv - p) (B - iii - q) (C - ii - r) (D - i - r)

Answer 1

The correct option is A (A - iii - p) (B - iv - q) (C - i - s) (D - ii - r)

The generation of a nerve impulse is the temporary removal of the resting potential in the neuron.
The correct matchings are
(i) Resting membrane potential: It is the state of electrical potential difference across the resting plasma membrane.
The state of resting membrane is called polarised state which occurs due to $N{a}^{+}and{K}^{+}$ pumps in which (Na^+\) is more on the outer side of the membrane.
(ii) Action potential: It is the state which lasts for a very short period of time. $N{a}^{+}$ ions get greatly increased on the inner side of the membrane at the point of stimulation when the stimulus of adequate strength is applied to a polarised membrane.
(iii) Depolarization: It is a positive charge in a cell membrane making it more positive or less negative. In this $N{a}^{+}$ ion channel opens due to which more positive charge gets accumulated on the inner side of membrane.
(iv) Repolarisation: It is a state of re - establishment of polarity, where resting potential is restored at the site of excitation. It is followed by a rise of impermeability to $K^{+}$, i.e. within a fraction of a second, $N{a}^{+}$ influx stops and $K^{+}$ out flow begins ($K^{+}$ ions moves on the outer side).