Photographs of basal cell carcinoma, squamous cell carcinoma and melanoma.

FIGURE 32–14 Skin Cancer Early detection is important in treating skin cancer. Signs of skin cancer may include a sore that does not heal or a sudden change in a mole's appearance. You should also see a doctor if you notice a new mole that is larger than 6 mm, has irregular borders, or is an odd color.

d

Skin Cancer Excessive exposure to the ultraviolet radiation in sunlight and artificial radiation from tanning beds can produce skin cancer, an abnormal growth of cells in the skin. Figure 32–14 shows examples of the three most common types of skin cancer, including melanoma, the most dangerous form. Over 60,000 people are diagnosed with melanoma every year in the United States, and as many as 8000 people die from it.

You can help protect yourself from this dangerous disease by avoiding tanning salons and wearing a hat, sunglasses, and protective clothing whenever you plan to spend time outside. In addition, you should always use a sunscreen that protects against both UV-A rays and UV-B rays and that has a sun protection factor (SPF) of at least 15.

In Your Notebook Summarize the steps you can take to protect your skin from sun damage.

32.3 Assessment

Review Key Concepts

    1. Review List the functions of the integumentary system.

    2. Classify What organs and tissues make up the integumentary system?

    1. a. Review What structures are found in the epidermis? What structures are found in the dermis?

    2. b. Apply Concepts Explain two ways that the skin can help remove excess heat from the body.

    1. Review What are some ways to reduce your risk of developing skin cancer?

    2. Sequence Explain the events that lead to acne.

Apply the Big idea

Structure and Function

  1. Compare and contrast the structure and function of the dermal tissue in plants discussed in Chapter 23 with the structures in human skin. Hint: You may wish to organize your ideas in a Venn diagram.

End ofPage 939

Table of Contents

Miller & Levine Biology
About the Authors
Changing the World of Biology Education
Contents
Diversity of Life: A Visual Guide DOL•1–DOL•64
Labs and Activities
Features
UNIT 1 The Nature of Life
1 The Science of Biology
2 The Chemistry of Life
Unit Project
UNIT 2 Ecology
3 The Biosphere
4 Ecosystems and Communities
5 Populations
6 Humans in the Biosphere
Unit Project
UNIT 3 Cells
7 Cell Structure and Function
8 Photosynthesis
9 Cellular Respiration and Fermentation
10 Cell Growth and Division
Unit Project
UNIT 4 Genetics
11 Introduction to Genetics
12 DNA
13 RNA and Protein Synthesis
14 Human Heredity
15 Genetic Engineering
Unit Project
UNIT 5 Evolution
16 Darwin's Theory of Evolution
17 Evolution of Populations
18 Classification
19 History of Life
Unit Project
UNIT 6 From Microorganisms to Plants
20 Viruses and Prokaryotes
21 Protists and Fungi
22 Introduction to Plants
23 Plant Structure and Function
24 Plant Reproduction and Response
Unit Project
UNIT 7 Animals
25 Introduction to Animals
26 Animal Evolution and Diversity
27 Animal Systems I
28 Animal Systems II
29 Animal Behavior
Unit Project
UNIT 8 The Human Body
30 Digestive and Excretory Systems
31 Nervous System
32 Skeletal, Muscular, and Integumentary Systems
33 Circulatory and Respiratory Systems
34 Endocrine and Reproductive Systems
35 Immune System and Disease
Unit Project
A Visual Guide to The Diversity of Life
HOW TO USE THIS GUIDE
THE TREE OF LIFE
Bacteria
Protists
Fungi
Plants
Animals
Appendices
Appendix A Science Skills
Appendix B Lab Skills
Appendix C Technology & Design
Appendix D Math Skills
Appendix E Periodic Table
Glossary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q, R
S
T
U
V
W
X, Y, Z
Index
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Credits
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