Nokea
The outer layer of the epidermis provides the most effective barrier to penetration of the skin by environmental factors. Which of the following is an example of penetration by an environmental factor?
- A. An insect bite
- B. Dehydration
- C. Sunburn
- D. Excessive perspiration
Correct Answer: A
Rationale: An insect bite represents penetration of the skin by an environmental factor, breaching the stratum corneum. Dehydration, sunburn, and perspiration are not examples of penetration.
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A nurse in the emergency department (ED) is triaging a 5-year-old who has been brought to the ED by her parents for an outbreak of urticaria. What would be the most appropriate question to ask this patient and her family?
- A. Has she eaten any new foods today?
- B. Has she bathed in the past 24 hours?
- C. Did she go to a friends house today?
- D. Was she digging in the dirt today?
Correct Answer: A
Rationale: Food allergies are a common cause of urticaria in children. Bathing, visiting friends, or soil exposure are less likely to be relevant triggers.
A wound care nurse is reviewing skin anatomy with a group of medical nurses. Which area of the skin would the nurse identify as providing a cushion between the skin layers, muscles, and bones?
- A. Dermis
- B. Subcutaneous tissue
- C. Epidermis
- D. Stratum corneum
Correct Answer: B
Rationale: The subcutaneous tissue (hypodermis) cushions between skin layers, muscles, and bones. The dermis provides strength, the epidermis is the outer layer, and the stratum corneum is the outermost epidermal layer.
A patient is suspected of developing an allergy to an environmental substance and has been given a patch test. During the test, the patient develops fine blisters, papules, and severe itching. The nurse knows that this is indicative of what strength reaction?
- A. Weak positive
- B. Moderately positive
- C. Strong positive
- D. Severely positive
Correct Answer: B
Rationale: Fine blisters, papules, and severe itching indicate a moderately positive patch test reaction. Weak positive shows redness and itching, while strong positive includes blisters and ulceration.
A nurse is explaining the importance of sunlight on the skin to a woman with decreased mobility who rarely leaves her house. The nurse would emphasize that ultraviolet light helps to synthesize what vitamin?
- A. E
- B. D
- C. A
- D. C
Correct Answer: B
Rationale: Ultraviolet light exposure aids in synthesizing vitamin D, essential for preventing rickets and supporting bone health. Vitamins E, A, and C are not synthesized via sunlight.
A new patient has come to the dermatology clinic to be assessed for a reddened rash on his abdomen. What diagnostic test would most likely be ordered to identify the causative allergen?
- A. Skin scrapings
- B. Skin biopsy
- C. Patch testing
- D. Tzanck smear
Correct Answer: C
Rationale: Patch testing identifies allergens causing contact dermatitis. Skin scrapings are for fungal infections, biopsies rule out malignancy, and Tzanck smears diagnose blistering conditions.