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Ch. 5 The Integumentary System
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMartini, Nath, Bartholomew 11th EditionCh. 5 The Integumentary SystemProblema 19
Capitolo 5, Problema 19

List the four phases in the regeneration of the skin after an injury.

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Understand that skin regeneration after an injury occurs in a series of well-defined phases, each with specific cellular activities and purposes.
Identify the first phase as the Hemostasis phase, where blood clotting occurs to stop bleeding and form a temporary barrier.
Recognize the second phase as the Inflammatory phase, during which immune cells clean the wound of debris and pathogens to prevent infection.
Know that the third phase is the Proliferative phase, where new tissue forms through processes like epithelialization, collagen deposition, and angiogenesis.
Finally, the fourth phase is the Maturation (or Remodeling) phase, where the newly formed tissue strengthens and reorganizes to restore skin integrity.

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Inflammation Phase

This initial phase begins immediately after injury, where blood vessels constrict to stop bleeding, followed by dilation to allow immune cells to enter the wound. These cells clear debris and pathogens, setting the stage for healing.
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Inflammation

Proliferation Phase

During this phase, new tissue forms as fibroblasts produce collagen and new blood vessels develop (angiogenesis). Keratinocytes migrate to cover the wound, promoting re-epithelialization and restoring the skin barrier.
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Phases of Mitosis

Remodeling (Maturation) Phase

In this final phase, collagen fibers reorganize and strengthen the tissue, improving tensile strength. Excess cells undergo apoptosis, and the skin gradually regains its normal structure and function over weeks to months.
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Affinity Maturation
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Why is it important for a surgeon to choose—when possible—an incision pattern according to the skin's tension lines?

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In which layer(s) of the epidermis does cell division occur?

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The fibrous protein that is responsible for the strength and water resistance of the skin surface is

(a) Collagen

(b) Eleidin

(c) Keratin

(d) Elastin

(e) Keratohyalin

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What widespread effects does epidermal growth factor (EGF) have on the integument?

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What two major layers constitute the dermis, and what components are in each layer?

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In clinical practice, drugs can be delivered by diffusion across the skin. This delivery method is called transdermal administration. Why are fat-soluble drugs more suitable for transdermal administration than drugs that are water soluble?

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