Nerve Impulse Conduction

Q. Immediately after the peak of action potential which cellular channel opens.

1. Sodium
2. Potassium
3. Both sodium and potassium
4. Calcium

Q. What would be Ψp in cell A and cell B respectively?

1. -800 kPa, -600 kPa
2. +3200 kPa, +2200 kPa
3. +800 kPa, +600 kPa
4. -1000 kPa, -600 kPa

Q. Explain the process of conduction of a nerve impulse along a nerve fibre.

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

1. (A - iii - p) (B - iv - q) (C - i - s) (D - ii - r)
2. (A - ii - s) (B - i - r) (C - iii - p) (D - iv - q)
3. (A - iv - q) (B - iii - p) (C - i - p) (D - i - s)
4. (A - iv - p) (B - iii - q) (C - ii - r) (D - i - r)

Q.

Fill in the blanks with correct words.

The axon transmits_______ away from the cell body to a synapse.

Q.

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

1. Neurotransmitters are released by dendrites and not by axon endings

2. Sodium pump starts operating only at the cyton and then continues into the nerve fibre

3. Neurotransmitters are released by the axon endings and not by dendrites

4. Nerve fibre is insulated by a medullary sheath

Q. During the propagation of a nerve impulse, the action potential results from the movement of:

1. $K^{+}$ ions from intracellular fluid to extracellular fluid
2. $N{a}^{+}$ ions from extracellular fluid to intracellular fluid
3. $K^{+}$ ions from extracellular fluid to intracellular fluid
4. $N{a}^{+}$ ions from intracellular fluid to extracellular fluid

Q. (a) Polarisation of the membrane of a nerve fibre

Q. Match the following stages of action potential to its corresponding state of ion movement

1. K⁺move in the cell
2. No net ion movement
3. K⁺move out of cell
   
4. Na⁺move in the cell

Q. Which cellular channels open immediately after the peak of action potential?

Q.

Define osmoreceptors

Q. Assertion : The axonal membrane of the neuron is more permeable to sodium ions ($N{a}^{+}$) and nearly impermeable to potassium ions ($K^{+}$).

Reason : In a resting state the neuron does not conduct any impulse.

1. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
2. If both Assertion and Reason are false.
3. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
4. If Assertion is true but Reason is false.

Q. mention the special features of the membrane of neurons