Chapter 5 Intro and Tasks
The Integumentary System
Introduction
From manicures and makeup to tanning lotions and tattoos, the integumentary system includes some of the most looked at and fussed over parts of every person’s body. At the same time, few other organ systems can boast as many common misconceptions as the skin. Some may think the skin is all “dead,” that the skin only includes the epidermis, that the sweat glands cause acne, that all skin cancers are easy to treat, and the list goes on. In many ways, acne is the perfect disease for discussing the many parts and activities in the integumentary system. For one thing, just about everyone has experienced acne to some extent during his or her life. In addition, acne directly or indirectly impacts nearly every aspect of the integumentary system. In this chapter, we’ll look at which types of glands in the skin are most directly involved (sebaceous glands), and where those glands are located. We’ll also cover how excess epidermal growth and keratinization can contribute to the problem. We will then learn that after bacteria invade blocked ducts, the immune system, including dendritic cells, responds with inflammation. Inflammation exerts pressure within the skin, which stimulates sensory nerve fibers in the epidermis and dermis. This means breakouts can be quite painful and irritating. Finally, healing occurs, with scar tissue forming in areas where damage was more extensive—perhaps by impatient poking and squeezing!
Objectives
- Describe the main structural features of the epidermis, and explain the functional significance of each.
- Explain what accounts for individual differences in skin color, and discuss the response of elanocytes to sunlight exposure.
- Describe the interaction between sunlight and vitamin D3 production.
- Describe the roles of epidermal growth factor.
- Describe the structure and functions of the dermis.
- Describe the structure and functions of the hypodermis.
- Describe the mechanisms that produce hair, and explain the structural basis for hair texture and color.
- Discuss the various kinds of glands in the skin, and list the secretions of those glands.
- Describe the anatomical structure of nails, and explain how they are formed.
- Explain how the skin responds to injury and repairs itself.
- Summarize the effects of aging on the skin.
Tasks
Below are the tasks associated with this chapter. You can access the following items by clicking the links below.
- Read Chapter 5 in your textbook.
- Take notes on the chapter outline as you read.
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Textbook Review
- Chapter 5 Review Questions View the slide presentation. Click the correct answer to the question within the presentation. Progress to the next question by using the arrow to move to the next slide. This serves as both a good preview and review to the content in this chapter.
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- Chapter 5 Quiz Show View the slide. Click on a dollar amount to see the question. Answer the question within the presentation. Progress to the next question. This serves as a good preview and review of the material in this chapter.
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Video Presentation(s)
You can view the applicable video presentations by going to the Pearson website.
Interactive Media (Optional Resources)
You can view the applicable interactive media presentations by going to the Pearson website. These are optional and are not graded.
- Review the key terms from your completed chapter outline.