Chapter 32, Problem 6A

Summary Introduction

Introduction:

The average accepted normal body temperature is $37°C$ . This temperature range might increase or decrease a little. But if the body temperature crosses over $38°C$ then it is normally assumed to be a fever caused by any infection disease or illness.

Answer to Problem 6A

Correct answer:

The correct answer is option (a) by increasing sweat production.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) as the internal temperature of the body is already high but it should not increase to a much greater extent that it starts disturbing the normal functioning. So, normalizing the body temperature every time when it exceeds the normal limit is very important. Heat present in the body activates sweat glands that throw water and salt to the surface of the skin in the form of sweat. When this water on the surface evaporates, it gives a cooling effect to the body.

Explanation for incorrect answer:

Option (b) Water retention usually occurs in the circulatory system of the body that causes swelling in some parts of the body. Their retention does not occur to maintain body temperature.

Option (c) Vitamin D is produced in the skin when ultraviolet rays from the sunlight strike surface of the skin and releases vitamin-D in the body.

Option (d) a layer of fat present below the dermis works as an insulator and keep the body protected from heat and cold. They also work as an energy storage area. Fibrous tissue holds the fat together that is present in the living cells.

Conclusion

The skin regulates body temperature by increasing sweat production.