Chapter 32, Problem 4A

Summary Introduction

Introduction:

Goose bumps are formed when tiny muscles at the base of each hair contract and pull the hair erect. The sympathetic nervous system is forms many fight or flight responses.

Answer to Problem 4A

Correct answer:

The correct answer is option (a) arrector pili muscle.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) arrecter pilli muscle.

Explanation for incorrect answer:

Option (c) adipose tissue is body fat that is found under the skin between muscles and bone marrow. They are not responsible for the formation of goosebumps.

Option (b) hair root is anchored in the follicle and is present at the surface of the skin. They do not participate in the formation of goosebumps.

Option (d) sebaceous gland is an exocrine gland present on the skin and opens up into the hair follicle that secretes an oily matter known as sebum. These acts as a lubricant for the mammal’s hair and skin and so are not responsible for the formation of goosebumps.

Conclusion

Arrector pili muscle is responsible for the formation of Goosebumps.