Nerve Impulse Conduction

Q. The sodium-potassium pump functions to pump ions into the cells and ions out of the cell.

1. sodium
2. iodide
3. chloride
4. potassium

Q.

Which of the following events increases when there is depolarization of a nerve fiber?

1. A positive charge in the intercellular fluid and a negative charge outside

2. A positive charge on both sides

3. A negative charge on both sides

4. A negative charge in the intercellular fluid and a positive charge outside

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.

If we open a sodium channel, give two reasons why positive sodium ions flow through the membrane into the cell?

Q. If a part of an axonal membrane becomes more permeable to ${\mathrm{Na}}^{+}$ ions, the membrane becomes .

1. hyperpolarised
2. depolarised
3. polarised

Q. During the transmission of nerve impulse throgh a nerve fibre, the potential on the innerside of the plasma membrane has which type of electric charge?

1. First negative then positive and again back to negative
   
2. First positive then negative and continue to be negative
   
3. First negative then positive and continue to be positive
   
4. First positive then negative and again back to positive

Q. Match the following column I and column II:

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Resting potential}& \text{i. Na ions are more on the inside of the membrane at the site}\\ \text{B. Depolarization}& \text{ii. Potassium channels gets opened}\\ \text{C. Repolarization}& \text{iii. More K ions inside of the cell and more Na ions outside of the cell}\end{array}$

1. A-iii, B-i, C-ii
2. A-ii, B-iii, C-i
3. A-iii, B-ii, C-i
4. A-i, B-iii, C-ii

Q. Which of the following option is correct for statement 'X' and 'Y'?
Statement X: Immediately after repolarisation, ionic imbalance is created on both the sides of nerve fibre.
Statement Y: During repolarisation $K^{+}$ ion channel open up and $K^{+}$ ion moves on inner side of plasma membrane.

1. Statements X and Y are correct and Y is not correct for X
2. Statements X and Y are correct and Y is correct for X
3. Statements X is correct and statement Y incorrect
4. Statement X is incorrect and statement Y is correct.

Q. Arrange th steps in nerve impulse conduction in the correct order.

1. $\mathrm{Na}\mathrm{ions}\mathrm{flow\; in}$
2. Action potential
3. $\mathrm{Stimulus}$
4. $\mathrm{Hyperpolarization};\mathrm{RMP}$
5. $\mathrm{Repolarisation}$

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

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

Q. What is the function of ion channels in conduction of nerve impulse?

1. Maintenance of concentration gradient of ions
2. Maintenance and change in electric potential
3. Transport of Na ion to the inner side of the membrane
4. All of the above

Q.

Stimulation of a neuron in resting state causes _____.

1. Depolarisation

2. Hyperpolarization

3. Repolarisation

4. No change in the state of rest

Q. Match the following column I and column II:

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Resting potential}& \text{i. Na ions are more on the inside of the membrane at the site}\\ \text{B. Depolarization}& \text{ii. Potassium channels gets opened}\\ \text{C. Repolarization}& \text{iii. More K ions inside of the cell and more Na ions outside of the cell}\end{array}$

1. A-iii, B-i, C-ii
2. A-ii, B-iii, C-i
3. A-iii, B-ii, C-i
4. A-i, B-iii, C-ii

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 true and the Reason is the correct explanation of the Assertion.
3. If both Assertion and Reason are false.
4. If Assertion is true but Reason is false.