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Ch. 6 The Muscular System
Marieb - Essentials of Human Anatomy & Physiology 13th Edition
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Not the one you use?Change textbook
All textbooksMarieb 13th EditionCh. 6 The Muscular SystemProblem 22
Chapter 6, Problem 22

Michael had a nervous habit of chewing on the inner lining of his lip with his front teeth. The lip grew thicker and thicker from years of continual irritation. Michael's dentist noticed his greatly thickened lip, then told him to have it checked to see if the thickening was a tumor. A biopsy revealed hyperplasia, but no evidence of neoplasia. What do these terms mean? Did Michael have cancer of the mouth?

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Understand the term 'hyperplasia': Hyperplasia refers to an increase in the number of cells in a tissue or organ, leading to its enlargement. This process is typically a response to irritation or stimulation and is not necessarily cancerous.
Understand the term 'neoplasia': Neoplasia refers to the abnormal and uncontrolled growth of cells, which can form a tumor. Neoplasia is often associated with cancer, but not all neoplasms are malignant (cancerous).
Differentiate between hyperplasia and neoplasia: Hyperplasia is a controlled and reversible increase in cell number, often due to chronic irritation or stimulation, whereas neoplasia involves uncontrolled and potentially irreversible cell growth that may lead to cancer.
Interpret the biopsy results: The biopsy revealed hyperplasia, meaning Michael's lip thickening was due to an increase in cell number caused by irritation from his chewing habit. Importantly, there was no evidence of neoplasia, indicating no uncontrolled or cancerous cell growth.
Conclude whether Michael had cancer: Based on the biopsy results showing hyperplasia without neoplasia, Michael did not have cancer of the mouth. However, the dentist's recommendation to monitor the thickened tissue was prudent, as chronic irritation can sometimes lead to further complications.

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Key Concepts

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

Hyperplasia

Hyperplasia refers to an increase in the number of cells in a tissue or organ, leading to its enlargement. This condition can occur as a response to various stimuli, such as chronic irritation or inflammation. In Michael's case, the thickening of his lip is a result of hyperplasia due to his habit of chewing, indicating a benign process rather than a malignant one.

Neoplasia

Neoplasia is the process of abnormal and uncontrolled cell growth, which can lead to the formation of tumors. Neoplasms can be benign (non-cancerous) or malignant (cancerous). The absence of neoplasia in Michael's biopsy suggests that there are no cancerous cells present, reinforcing that his condition is not cancerous.

Biopsy

A biopsy is a medical procedure that involves the extraction of tissue samples for diagnostic examination. It is commonly used to determine the presence of disease, particularly cancer. In Michael's situation, the biopsy was crucial in distinguishing between hyperplasia and neoplasia, ultimately confirming that he did not have cancer of the mouth.
Related Practice
Textbook Question

When Eric returned from jogging, he was breathing heavily and sweating profusely, and he complained that his legs ached and felt weak. On the basis of what you have learned about muscle energy metabolism, respond to the following questions:

b. What ATP-harvesting pathway have his working muscles been using that leads to such a breathing pattern?

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Textbook Question

Chemical A binds and blocks acetylcholine receptors of muscle cells. Chemical B floods the cytoplasm of muscle cells with calcium ions. Which chemical would make the best muscle relaxant, and why?

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Textbook Question

When Eric returned from jogging, he was breathing heavily and sweating profusely, and he complained that his legs ached and felt weak. On the basis of what you have learned about muscle energy metabolism, respond to the following questions: c. What metabolic product(s) might account for his sore muscles and his feeling of muscle weakness?

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