Skin Anatomy, Physiology, and Wound Healing Practice Questions

25 multiple-choice questions on Skin anatomy, physiology, and wound healing for paramedic and EMT students, from Chapter 32 (Soft-Tissue Trauma). Read each question, pick your answer, then tap Show answer to check it and read the explanation.

25 practice questions

1. A cyclist has a large abrasion that is shallow but extremely painful. The pain is intense mainly because the scrape has:

   1. A. Cut through the deep muscle fascia
   2. B. Exposed many dermal nerve endings
   3. C. Exposed the fat beneath it
   4. D. Released histamine from mast cells
   Show answer

   Answer: B. Exposed many dermal nerve endings

   Abrasions remove the epidermis and expose the upper dermis, where free nerve endings are plentiful, so they hurt a great deal even though they are shallow and bleed only by oozing. A shallow scrape does not reach the subcutaneous fat or the fascia, and histamine mainly causes itching and swelling rather than this intense pain.

2. A deep laceration across the front of the elbow heals with a thick scar. Months later the patient cannot fully straighten the arm. This is most likely due to:

   1. A. A keloid that grew past the wound
   2. B. Reopening of the healed wound
   3. C. Scar contracture across the joint
   4. D. Normal swelling from the healing
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   Answer: C. Scar contracture across the joint

   As scars mature, collagen remodels and the scar shortens. Across a joint this can create a contracture that limits motion, which is one reason wounds over joints need careful repair and follow-up. A keloid is raised overgrowth, not shortening, the wound has not reopened, and months later this is not ordinary swelling.

3. A deep laceration that extends into a thick subcutaneous fat layer is at greater risk of infection mainly because fat:

   1. A. Contains the most skin bacteria
   2. B. Heals faster than other tissue
   3. C. Blocks all immune cells completely
   4. D. Has a relatively poor blood supply
   Show answer

   Answer: D. Has a relatively poor blood supply

   Adipose tissue is less vascular than skin or muscle, so fewer immune cells and less oxygen reach it, and dead space in fat can collect fluid and bacteria. This is part of why obesity raises wound infection risk. Fat does not heal faster, it is not where skin bacteria live, and it does not completely block immune cells.

4. Which function of the skin is lost first when a large area of epidermis is scraped away?

   1. A. Infection barrier
   2. B. Sensation of touch and pain
   3. C. Storage of glycogen
   4. D. Sweating from the dermal glands
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   Answer: A. Infection barrier

   Intact skin is the body's first line of defense against microorganisms, so any break opens a route for infection. Sweat glands and most sensory nerve endings sit in the dermis, which a scrape leaves in place, so sweating continues and the exposed nerves make the wound more sensitive, not less. The skin does not store glycogen.

5. The skin helps regulate body temperature mainly by:

   1. A. Shivering of the dermal muscles
   2. B. Changing blood flow and sweating
   3. C. Storing heat in the epidermis
   4. D. Producing heat in sebaceous glands
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   Answer: B. Changing blood flow and sweating

   Dilation of dermal vessels and sweat evaporation release heat; vasoconstriction conserves it. Shivering is skeletal muscle activity, not a dermal function.

6. Melanocytes in the skin produce pigment that protects the body from:

   1. A. UV radiation
   2. B. Bacterial invasion
   3. C. Fluid loss
   4. D. Mechanical shearing
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   Answer: A. UV radiation

   Melanin absorbs UV light and protects the DNA of deeper cells. The physical barrier against bacteria is provided by keratinized cells and the skin's acidic surface, not melanin.

7. Tension lines (Langer lines) are important in soft-tissue trauma because a laceration that runs across them tends to:

   1. A. Close on its own quickly
   2. B. Bleed less than other cuts
   3. C. Resist wound infection
   4. D. Gape open and scar more
   Show answer

   Answer: D. Gape open and scar more

   Lacerations perpendicular to skin tension lines are pulled apart by the skin's elastic fibers, so they gape and heal with wider scars. A gaping wound does not close on its own, and wound direction has no meaningful effect on infection risk.

8. The deep fascia is clinically important in soft-tissue trauma because it:

   1. A. Produces new skin cells after injury
   2. B. Carries the main sensory nerves
   3. C. Encloses muscles in compartments
   4. D. Stores fat for wound healing
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   Answer: C. Encloses muscles in compartments

   Fascia is tough and does not stretch, so swelling inside a fascial compartment raises pressure and can cause compartment syndrome. New skin cells come from the epidermis, not the fascia.

9. The first phase of wound healing is:

   1. A. Inflammation
   2. B. Hemostasis
   3. C. Epithelialization
   4. D. Collagen synthesis
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   Answer: B. Hemostasis

   Vessel constriction, platelet aggregation, and clot formation must first stop the bleeding. Inflammation follows immediately afterward and is the most common wrong answer because it begins within minutes.

10. During the inflammatory phase of wound healing, white blood cells move into the wound to:

    1. A. Form new collagen fibers
    2. B. Create a new layer of skin
    3. C. Remove bacteria and debris
    4. D. Contract the wound edges
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    Answer: C. Remove bacteria and debris

    Neutrophils and macrophages clean the wound, and histamine increases capillary permeability so these cells can reach it. Collagen is laid down later in healing, not by the first white cells to arrive.

11. Redness, warmth, and swelling around a fresh wound during the first day or two are best explained by:

    1. A. Normal inflammation
    2. B. Early necrotizing fasciitis
    3. C. Gas gangrene developing
    4. D. An allergic contact reaction
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    Answer: A. Normal inflammation

    Histamine-driven vasodilation and capillary leak cause these local signs as part of normal healing. Necrotizing fasciitis is a tempting answer, but it causes spreading pain out of proportion to the findings and systemic illness, not mild local redness.

12. Epithelialization is the phase of healing in which:

    1. A. Platelets plug the damaged capillaries
    2. B. Fibroblasts lay down scar collagen
    3. C. Granulation tissue fills the wound
    4. D. New epithelial cells cover the wound
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    Answer: D. New epithelial cells cover the wound

    Epithelial cells at the wound edges divide and migrate to restore a barrier across the surface. Laying down scar collagen is a separate, later phase that gives the wound strength, and platelet plugging belongs to hemostasis.

13. Neovascularization during wound healing refers to:

    1. A. Constriction of injured vessels
    2. B. Clotting within damaged arteries
    3. C. Leaking of plasma into tissues
    4. D. New capillaries grow into the wound
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    Answer: D. New capillaries grow into the wound

    New capillaries bring oxygen and nutrients to healing tissue, and they are fragile, so a healing wound bleeds easily. Vessel constriction belongs to the hemostasis phase.

14. The cells that produce collagen to give a healing wound strength are:

    1. A. Neutrophils
    2. B. Melanocytes
    3. C. Fibroblasts
    4. D. Platelets
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    Answer: C. Fibroblasts

    Fibroblasts lay down collagen that binds the wound edges together. Neutrophils are the first white cells in the wound, but they clean it rather than build it.

15. Several weeks after a laceration has healed, the scar is best described as:

    1. A. Stronger than the original skin
    2. B. Weaker than the surrounding skin
    3. C. Equal in strength to normal skin
    4. D. Fully elastic like normal skin
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    Answer: B. Weaker than the surrounding skin

    Collagen remodeling continues for months, but scar tissue never regains the full tensile strength of uninjured skin. Students often assume a scar is stronger because it feels firm.

16. A keloid is best described as:

    1. A. Scar overgrowth past the wound edges
    2. B. A pocket of blood under the skin
    3. C. An area of dead tissue in the wound
    4. D. A collection of pus within the dermis
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    Answer: A. Scar overgrowth past the wound edges

    Keloids form when collagen is overproduced and grows beyond the original wound edges; they are more common in people with darker skin. A collection of blood is a hematoma, not a keloid.

17. A 58-year-old man who takes prednisone daily for COPD has a laceration on his forearm. You should anticipate that his wound will:

    1. A. Heal faster than in a healthy adult
    2. B. Develop a keloid within days
    3. C. Stop bleeding more quickly than usual
    4. D. Heal slowly and infect easily
    Show answer

    Answer: D. Heal slowly and infect easily

    Corticosteroids blunt the inflammatory response and collagen formation, so healing is slow and infection risk is high. They do not speed healing or clotting.

18. Which patient factor most strongly impairs wound healing?

    1. A. Daily low-dose aspirin use
    2. B. Poorly controlled diabetes
    3. C. Well-treated hypothyroidism
    4. D. Well-controlled hypertension
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    Answer: B. Poorly controlled diabetes

    Diabetes reduces blood flow and white cell function, slowing healing and raising infection risk. Low-dose aspirin may make a wound ooze a little longer, and treated thyroid disease or controlled blood pressure has little effect on repair.

19. A 72-year-old woman bumps her shin on a car door and the skin peels back in a thin flap. This injury occurred easily because aging skin has:

    1. A. Thicker epidermis and more keratin
    2. B. More subcutaneous fat for padding
    3. C. A thinner dermis and less collagen
    4. D. A greater number of sweat glands
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    Answer: C. A thinner dermis and less collagen

    The dermis thins and collagen and elastin decrease with age, so minor shear forces cause skin tears. Older adults also lose subcutaneous fat, the opposite of the tempting padding option.

20. A patient asks whether he should let his clean forearm laceration dry out and form a hard scab. Compared with a dry, scabbed wound, a wound kept clean, covered, and slightly moist:

    1. A. Heals faster and with less scarring
    2. B. Is more likely to become infected
    3. C. Heals at the same rate but scars more
    4. D. Heals slower because it cannot breathe
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    Answer: A. Heals faster and with less scarring

    A moist, covered wound lets new epithelial cells migrate across the surface more easily, so it typically heals faster and with less scarring than a dry wound under a hard scab. A clean, covered wound is not more likely to become infected because it is moist, it heals faster rather than at the same rate, and wounds do not need air exposure to heal.

21. Which wound is most likely to heal with the least scarring?

    1. A. A crushed wound with jagged edges
    2. B. A clean cut along tension lines
    3. C. A wound across tension lines
    4. D. An abrasion full of road debris
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    Answer: B. A clean cut along tension lines

    Clean edges that line up and lie parallel to skin tension heal by primary intention with a narrow scar. A wound across tension lines gapes and widens the scar even when clean.

22. A wound that is left open to fill in from the bottom with granulation tissue is said to heal by:

    1. A. Secondary intention
    2. B. Primary intention
    3. C. Tertiary intention
    4. D. Delayed epithelial fusion
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    Answer: A. Secondary intention

    Open wounds, such as infected or heavily contaminated ones, heal by secondary intention, which is slower and leaves a larger scar. Tertiary intention is delayed closure of a wound that was first left open.

23. A 30-year-old with a deep laceration asks why it itches during the second week. You explain that itching is common during:

    1. A. Early signs of a tetanus infection
    2. B. An allergic reaction to the sutures
    3. C. The hemostasis phase of healing
    4. D. Normal healing as new tissue forms
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    Answer: D. Normal healing as new tissue forms

    Itching is a common, benign sign of epithelialization and collagen formation. Hemostasis occurs in the first minutes, not the second week, and tetanus causes muscle rigidity rather than itching.

24. Which statement about blood supply and wound healing is correct?

    1. A. The lower leg heals faster than the face
    2. B. Fat tissue heals faster than muscle
    3. C. Areas with rich blood supply heal faster
    4. D. Poor perfusion speeds collagen formation
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    Answer: C. Areas with rich blood supply heal faster

    Good perfusion delivers oxygen, nutrients, and white cells, which is why facial and scalp wounds heal well. The lower leg has relatively poor circulation and heals slowly, especially in older adults.

25. A 45-year-old patient with peripheral vascular disease has a small foot wound. Compared with a healthy patient, this wound is at greater risk of:

    1. A. Excessive keloid formation
    2. B. Rapid wound contraction
    3. C. Spontaneous hematoma formation
    4. D. Delayed healing and infection
    Show answer

    Answer: D. Delayed healing and infection

    Poor arterial flow starves the wound of oxygen and immune cells, so healing is slow and infection or gangrene can follow. Keloids relate to collagen overproduction and genetics, not poor circulation.