Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Application of ice can reduce pain sensation.
Reason (R): The impulses which arrive through the relatively large diameter nerves block the pain impulses via the pain gate mechanism.
In the light of the above statements, choose the most appropriate answer.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Ice → Stimulates large fibers → Closes pain gate → Less pain

Answer 1

The Correct Option is A

Concept:
Cryotherapy (application of ice) is widely used to reduce pain and inflammation. One of the mechanisms involved is explained by the Gate Control Theory of Pain.

Step 1: Understanding Assertion (A).
Application of ice:
• Reduces nerve conduction velocity
• Decreases inflammation
• Produces analgesic (pain-reducing) effect Hence, Assertion (A) is correct.

Step 2: Understanding Reason (R).
According to Gate Control Theory:
• Large diameter nerve fibers (A-beta fibers) carry non-painful stimuli
• These impulses can inhibit transmission of pain signals (A-delta and C fibers) Thus, Reason (R) is correct.

Step 3: Linking A and R.
Ice application stimulates:
• Cutaneous receptors
• Large diameter sensory fibers These signals:
• Close the “pain gate” at spinal level
• Reduce perception of pain

Step 4: Conclusion.
\[ \boxed{\text{Both A and R are correct and R explains A}} \]