Assertion (A) : When an individual is exposed to hot climate, the body responds through vasodilation.
Reason (R) : Increased blood flow allows dissipation of heat from the core of the body to the environment through sweating.
In the light of the above statements, choose the most appropriate answer from the options given below :
Analyzing Body's Response to Heat
The question asks to evaluate two statements regarding the body's physiological response to hot climates.
Assertion (A) Analysis
Assertion (A) states that the body responds to hot climates through vasodilation. Vasodilation is the widening of blood vessels. In hot conditions, blood vessels near the skin surface widen to increase blood flow to the skin, facilitating heat loss from the body core to the environment. Therefore, Assertion (A) is correct.
Reason (R) Analysis
Reason (R) states that increased blood flow allows heat dissipation from the body core to the environment through sweating. The increased blood flow to the skin, caused by vasodilation, brings heat from the core to the surface. This heat can then be lost to the environment. Sweating enhances heat loss through evaporation. Thus, the increased blood flow supports the heat dissipation process, including sweating. Reason (R) is correct.
Relationship Between (A) and (R)
Assertion (A) identifies vasodilation as a response to heat. Reason (R) explains the mechanism by which this response, specifically the resulting increased blood flow, contributes to heat dissipation, a primary goal in a hot climate. The increased blood flow to the skin surface is essential for effective heat transfer to the environment and for supplying fluid to the sweat glands. Therefore, Reason (R) correctly explains Assertion (A).
Conclusion
Both statements (A) and (R) are factually correct, and (R) provides a valid explanation for why vasodilation occurs and how it contributes to thermoregulation in hot environments.
The most appropriate answer is that both (A) and (R) are correct and (R) is the correct explanation of (A).
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