Question:
With respect to the generation of nerve impulse, consider the following statements and identify the correct statement:
a) Any change to the membrane will cause \(\text{Na}^{+}\) to enter into the membrane.
b) As a result, the potential difference is lowered.
c) This makes the membrane more permeable to \(\text{Na}^{+}\)
d) So there will be rapid influx of \(\text{Na}^{+}\)
With respect to the generation of nerve impulse, consider the following statements and identify the correct statement:
a) Any change to the membrane will cause \(\text{Na}^{+}\) to enter into the membrane.
b) As a result, the potential difference is lowered.
c) This makes the membrane more permeable to \(\text{Na}^{+}\)
d) So there will be rapid influx of \(\text{Na}^{+}\)
a) Any change to the membrane will cause \(\text{Na}^{+}\) to enter into the membrane.
b) As a result, the potential difference is lowered.
c) This makes the membrane more permeable to \(\text{Na}^{+}\)
d) So there will be rapid influx of \(\text{Na}^{+}\)
Show Hint
Only a threshold stimulus opens sodium channels, after which sodium rushes in.
Updated On: Nov 12, 2026
- a, b and c only
- a, c and d only
- c and d only
- a, b, c and d.
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
A nerve impulse starts when a stimulus depolarises the membrane and opens voltage gated sodium channels.
Step 2: Check each statement
(a) is incorrect as only an adequate stimulus makes sodium enter.\n(b) is not correctly stated as the result of (a).\n(c) is correct: permeability to sodium rises.\n(d) is correct: sodium rushes in, reversing the polarity.
Step 3: Conclusion
Only c and d are correct.
Final Answer:
Only c and d are correct. \[ \boxed{\text{(C) }\text{c and d only}} \]
A nerve impulse starts when a stimulus depolarises the membrane and opens voltage gated sodium channels.
Step 2: Check each statement
(a) is incorrect as only an adequate stimulus makes sodium enter.\n(b) is not correctly stated as the result of (a).\n(c) is correct: permeability to sodium rises.\n(d) is correct: sodium rushes in, reversing the polarity.
Step 3: Conclusion
Only c and d are correct.
Final Answer:
Only c and d are correct. \[ \boxed{\text{(C) }\text{c and d only}} \]
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