Ch. 5 The Integumentary System

Amerman - Human Anatomy & Physiology 2nd Edition

Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook

Amerman 2nd Edition

Ch. 5 The Integumentary System

Problem L3.B6

Chapter 5, Problem L3.B6

Would a mild second-degree burn be likely to heal by regeneration or fibrosis? Would the same type of healing take place in a third-degree burn that involved muscle tissue? Why or why not?

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Understand the difference between regeneration and fibrosis: Regeneration involves the replacement of damaged tissue with the same type of tissue, restoring normal function. Fibrosis, on the other hand, involves the replacement of damaged tissue with scar tissue, which does not restore normal function.

Analyze the characteristics of a mild second-degree burn: A second-degree burn affects the epidermis and part of the dermis. In a mild case, the damage to the dermis is limited, and the epithelial cells in the basal layer or hair follicles can regenerate the damaged tissue. Therefore, healing is likely to occur through regeneration.

Consider the characteristics of a third-degree burn: A third-degree burn destroys the epidermis, dermis, and potentially underlying tissues such as muscle. In this case, the damage is extensive, and the structures necessary for regeneration (e.g., basal cells) are destroyed.

Explain why fibrosis is more likely in a third-degree burn: Since the regenerative structures are destroyed in a third-degree burn, the body relies on fibroblasts to produce collagen and form scar tissue. This process, known as fibrosis, replaces the damaged tissue but does not restore normal function.

Conclude the comparison: A mild second-degree burn is likely to heal by regeneration due to the presence of surviving epithelial cells, while a third-degree burn involving muscle tissue is more likely to heal by fibrosis because the regenerative structures are destroyed, and scar tissue formation is the primary mechanism of repair.

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Key Concepts

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

Wound Healing Processes

Wound healing involves two primary processes: regeneration and fibrosis. Regeneration refers to the restoration of tissue to its original state, typically occurring in mild injuries where the tissue can fully repair itself. Fibrosis, on the other hand, involves the formation of scar tissue when the damage is more extensive, preventing complete restoration of the original tissue structure.

Second-Degree Burns

Second-degree burns affect both the epidermis and part of the dermis, leading to pain, swelling, and blistering. These burns can heal through regeneration if the dermal layer is not severely damaged, allowing for the potential for complete recovery without significant scarring. The healing process typically takes a few weeks, depending on the severity and care of the burn.

Third-Degree Burns

Third-degree burns extend through the epidermis and dermis, affecting deeper tissues such as muscle and fat. This type of burn destroys the skin's ability to regenerate, leading to healing primarily through fibrosis, which results in scar formation. The healing process is prolonged and often requires medical intervention, including skin grafts, due to the extensive damage to the tissue.

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Related Practice

Textbook Question

Explain what happens to dermal blood vessels when heat needs to be conserved (i.e., due to a cold environment).

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Textbook Question

The disease pemphigus vulgaris involves a patient's own immune system attacking the desmosomes between the epithelial cells of the skin. What changes would you expect to see with this disease?

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Textbook Question

Number the strata of thick skin epidermis from deepest (1) to most superficial (5).

____Stratum spinosum

____Stratum corneum

____Stratum basale

____Stratum lucidum

____Stratum granulosum

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Textbook Question

Many antiaging skin creams contain collagen and hyaluronic acid. Manufacturers claim that the collagen and hyaluronic acid applied to the surface of the skin will be absorbed into the dermis, where they will be incorporated into dermal tissue.

Predict whether or not these substances are likely to be absorbed by the epidermis.

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Textbook Question

Keratinocytes in the superficial strata of the epidermis die because:

a. They are too far away from the blood supply in the dermis.

b. They are surrounded by a lipid-based substance that makes them more permeable to water.

c. They do not die.

d. No keratinocytes in the epidermis are alive.

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Textbook Question

Nguyen comes to your clinic with a mole that has recently changed in appearance. You examine the mole and note that its borders are irregular, it has a deep blue-black color, and the color is unevenly distributed throughout the mole.

Nguyen tells you that she has used a tanning booth once per week for the past several years and that the tanning salon advertises it as safe. What do you tell her about the tanning salon's claim? How does any UV exposure affect keratinocytes and melanocytes? Explain.

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