Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

4. Tissues & Histology

Characteristics of Epithelial Tissue

Anatomy & Physiology

4. Tissues & Histology

Characteristics of Epithelial Tissue

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1:04 minutes

Problem 22

Textbook Question

In adults, over 90% of all cancers arise in epithelium. Such cancers are called carcinomas, or adenomas (adenocarcinomas) if they arise in glandular epithelia. In fact, cancers of the skin, lung, colon, breast, and prostate are all in these categories. Why do you think this is so?

Verified step by step guidance

Understand that epithelial tissues are the layers of cells that cover the surfaces of the body, including the skin, and line internal organs and cavities.

Recognize that epithelial cells are constantly exposed to environmental factors such as UV radiation, chemicals, and pathogens, which can lead to DNA damage.

Consider that epithelial tissues have a high rate of cell division to replace cells that are lost due to wear and tear, increasing the likelihood of mutations during cell replication.

Acknowledge that the high turnover rate and exposure to carcinogens make epithelial cells more susceptible to accumulating genetic mutations that can lead to cancer.

Reflect on the fact that since epithelial tissues are widespread and cover many organs, they provide a large surface area where cancerous changes can occur, leading to a higher incidence of carcinomas and adenocarcinomas.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Carcinoma

Carcinomas are a type of cancer that originates in epithelial cells, which line the surfaces of organs and structures throughout the body. These cells are constantly exposed to environmental factors, making them more susceptible to mutations that can lead to cancer. Carcinomas can be further classified into adenocarcinomas when they arise from glandular tissues, highlighting the diversity of epithelial cells and their roles in various organs.

Epithelial Tissue

Epithelial tissue is one of the four primary types of tissue in the body, characterized by closely packed cells that form protective barriers and are involved in absorption, secretion, and sensation. This tissue covers the body surfaces, lines cavities, and forms glands, making it a critical component in maintaining homeostasis. Its high turnover rate and exposure to external factors contribute to the increased incidence of cancer in epithelial cells.

Risk Factors for Cancer

Risk factors for cancer include a variety of environmental, genetic, and lifestyle influences that can increase the likelihood of developing the disease. For epithelial cancers, factors such as UV radiation, smoking, dietary habits, and exposure to carcinogens play significant roles. Understanding these risk factors is essential for prevention and early detection strategies, particularly in high-risk populations.

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Related Practice

Textbook Question

Identify the six types of epithelial tissue shown in the drawing below.

e. ___

Textbook Question

Identify the six types of epithelial tissue shown in the drawing below.

f. ___

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Textbook Question

Which of the following epithelia most easily permits diffusion?

(a) Stratified squamous

(b) Simple squamous

(d) Simple columnar

Textbook Question

What are the four essential functions of epithelial tissue?

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Textbook Question

In adults, over 90% of all cancers are either adenomas (adenocarcinomas) or carcinomas. In fact, cancers of the skin, lung, colon, breast, and prostate are all in these categories. Which one of the four basic tissue types gives rise to most cancers? Why do you think this is so?

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Textbook Question

Why are there no skin cancers that originate from stratum corneum cells?

1118

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Multiple Choice

Most cancers develop in epithelial tissues. Which epithelial tissue characteristic makes them prone to cancer?

Together the basal lamina and the reticular lamina make up the _____________________. The basal lamina is produced by the _________________, while the reticular lamina is produced by the ____________________.

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