Textbook Question
Identify the six types of epithelial tissue shown in the drawing below.
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4. Tissues & Histology
Characteristics of Epithelial Tissue
1:04 minutesProblem 23
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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Identify the four basic tissue types in the human body: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.
Understand that adenomas (adenocarcinomas) and carcinomas originate from epithelial tissue, which lines organs and body surfaces.
Recognize that most cancers arise from epithelial tissue because it has a high rate of cell turnover and frequent cell division, increasing the chance of mutations during DNA replication.
Consider that epithelial tissues are exposed to environmental factors (like UV radiation, chemicals, and pathogens) that can cause DNA damage, further increasing cancer risk.
Conclude that the combination of rapid cell division and environmental exposure makes epithelial tissue the primary source of most cancers.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Basic Tissue Types
The human body is composed of four basic tissue types: epithelial, connective, muscle, and nervous tissues. Each type has distinct structures and functions. Understanding these categories helps identify the origin of various cancers, as most arise from one specific tissue type.
Epithelial Tissue and Carcinomas
Epithelial tissue lines organs and body surfaces, forming protective barriers and involved in absorption and secretion. Carcinomas, which are cancers arising from epithelial cells, are the most common type of cancer because epithelial cells frequently divide and are exposed to environmental damage.
Cell Division and Cancer Development
Cancer often develops in tissues with high rates of cell division, as frequent replication increases the chance of genetic mutations. Epithelial tissues undergo constant renewal, making them more susceptible to mutations that can lead to adenomas and carcinomas.
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