Question 5

Heat transfer from the person to the surroundings increases.

When a person is exposed to warm conditions, increased blood circulation to capillaries near the skin surface enhances the transfer of heat from the body to the surrounding environment.

A) Heat transfer from the person to the surroundings increases.

This option is correct because as blood vessels dilate and blood flow increases to the skin's surface, heat is released more effectively into the environment. This process helps regulate body temperature by facilitating cooling through conduction, convection, and radiation.

B) Heat is absorbed from the skin, thus reducing sunburn.

This option is incorrect because the primary function of increased blood circulation in warm conditions is to dissipate heat, not absorb it. Absorbing heat would lead to an increase in skin temperature, potentially exacerbating sunburn rather than reducing it.

C) CO2 and O2 are exchanged directly through the skin rather than the lungs.

This option is incorrect as gas exchange primarily occurs in the lungs, not through the skin. While the skin can play a minor role in gas exchange in some organisms, in humans, the circulatory and respiratory systems are responsible for this function.

D) Water from the air is absorbed into the body.

This option is incorrect because the body's absorption of water through the skin is minimal and not a primary function of increased blood circulation. The skin primarily serves as a barrier rather than a means of absorbing moisture from the air.

Conclusion

In summary, the correct answer A reflects the physiological response to warm conditions where increased blood circulation enhances heat transfer, thereby promoting cooling. Options B, C, and D fail to align with the body's response mechanisms related to temperature regulation and heat dissipation.