Melanocytes give rise to the pigment melanin, which is responsible for skin color. Where can the melanocytes be found?
Loose connective tissue
Epidermis
Dermis
Superficial fascia
The Correct Answer is B
A. Loose connective tissue:
Melanocytes are not typically found in loose connective tissue. Their primary location is within the epidermis, specifically in the basal layer, where they interact with keratinocytes to produce melanin and contribute to skin color. Loose connective tissue contains collagen and elastin fibers, as well as fibroblasts, but it does not house melanocytes.
B. Epidermis:
This is the correct answer. Melanocytes are primarily located in the basal layer of the epidermis, which is the deepest layer of the epidermis. These cells produce melanin, a pigment that helps protect the skin from UV radiation and determines skin color. Melanocytes are interspersed among keratinocytes in the epidermis and transfer melanin to keratinocytes to provide skin pigmentation.
C. Dermis:
The dermis is the layer of skin beneath the epidermis and consists of connective tissue, blood vessels, nerves, hair follicles, and sweat glands. While the dermis plays a crucial role in supporting and nourishing the epidermis, melanocytes are not primarily located in the dermis. They are confined to the basal layer of the epidermis.
D. Superficial fascia:
The superficial fascia, also known as the subcutaneous tissue or hypodermis, lies beneath the dermis and consists of adipose (fat) tissue and connective tissue. It provides insulation, energy storage, and cushioning for underlying structures. However, melanocytes are not typically found in the superficial fascia. They are restricted to the epidermis, specifically the basal layer, where they carry out their function of melanin production.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Assess the patient’s respiratory rate, rhythm, depth:
This is the correct action to take first. Hypokalemia can lead to respiratory muscle weakness, which can result in respiratory compromise or failure. Assessing the patient's respiratory rate, rhythm, and depth will help determine if there are any signs of respiratory distress or impending respiratory failure.
B. Call the healthcare provider:
While it's important to involve the healthcare provider, especially if there is a significant change in the patient's condition, assessing the patient's immediate respiratory status takes priority to ensure prompt intervention if respiratory distress is present.
C. Document findings and monitor the patient:
Documenting findings and ongoing monitoring are essential steps, but they come after addressing the patient's immediate needs, such as assessing respiratory status in this case.
D. Measure the patient’s pulse and blood pressure:
While vital signs are important, they may not immediately address the potential respiratory compromise associated with hypokalemia-induced muscle weakness. Assessing respiratory status is more directly relevant to the observed change in handgrip strength.
Correct Answer is D
Explanation
A. Stage III pressure injury
Stage III pressure injuries involve full-thickness skin loss, extending into the subcutaneous tissue but not through the fascia. These wounds typically present as deep craters and may involve undermining or tunneling. Non-blanchable erythema alone without visible skin loss is not characteristic of a Stage III pressure injury.
B. Stage IV pressure injury
Stage IV pressure injuries are the most severe and involve full-thickness tissue loss with exposed bone, tendon, or muscle. These wounds often have extensive tissue damage and can be difficult to manage. Again, non-blanchable erythema without visible skin loss is not indicative of a Stage IV pressure injury.
C. Stage II pressure injury
Stage II pressure injuries involve partial-thickness skin loss with damage to the epidermis and possibly the dermis. These wounds often present as shallow open ulcers or blisters and may have characteristics such as intact or ruptured blisters. While Stage II injuries can present with erythema, non-blanchable erythema specifically indicates a Stage I injury.
D. Stage I pressure injury
Stage I pressure injuries are the earliest stage and involve non-blanchable erythema of intact skin. The skin may be warmer or cooler than surrounding tissue and may have changes in sensation. There is no visible skin loss at this stage, but the area is at risk for further injury if pressure is not relieved. Therefore, non-blanchable erythema on the heels most likely indicates a Stage I pressure injury.
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