In adult humans, most cancers are carcinomas or adenocarcinomas. These include cancers of the skin, lung, colon, breast, and prostate. Which of the four basic tissue types is involved, and why?

The correct answer is: Epithelial tissue, because 1) it's in direct contact with the environment, and 2) their cells are rapidly dividing. The two factors contribute greatly to the appearance of cancer.

Explanation:

Epithelial tissue is one of the four basic tissue types (along with connective tissue, muscle tissue, and nervous tissue), and it is characterized for being avascular (there are no blood vessels in it), being very cellular (it has many cells and not many fibers), having polarity, being capable of regeneration, and being attached to a basal membrane.

The main function of the epithelial tissue can vary from the location of it, since it gives each organ a function, but as a whole, we could say it is involved in transport, secretion, protection, sensing, and absorption.

While the epithelial tissue's characteristics (such as their rapid regeneration) are crucial for its highly important functions, this can also make them home to carcinomas and adenocarcinomas.

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