Which is the function of the keratinocytes, a type of skin cell?
To serve as sensory receptors and transmitters for the sense of touch.
To anchor the epidermis to the dermis skin layer.
To provide skin pigmentation as protection from the sun's ultraviolet rays.
To produce a tough, fibrous structural protein for skin protection.
The Correct Answer is D
A. To serve as sensory receptors and transmitters for the sense of touch. Merkel cells, not keratinocytes, function as sensory receptors in the skin, particularly for touch perception.
B. To anchor the epidermis to the dermis skin layer. Hemidesmosomes and basement membrane proteins help anchor the epidermis to the dermis, not keratinocytes.
C. To provide skin pigmentation as protection from the sun's ultraviolet rays. Melanocytes, not keratinocytes, produce melanin, which provides skin pigmentation and protects against UV radiation.
D. To produce a tough, fibrous structural protein for skin protection. Keratinocytes are the primary cells of the epidermis and produce keratin, a strong, fibrous protein that provides structure, durability, and waterproofing to the skin. They also play a role in wound healing and immune defense.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C","D","E","G"]
Explanation
A. Immobility. The client requires a walker for mobility and reports difficulty repositioning in bed. Limited mobility increases the risk of pressure injuries due to prolonged pressure on certain areas, reducing blood flow and oxygen delivery to the skin.
B. Obesity. The client has a history of moderate obesity, which increases skin friction, moisture retention, and difficulty with self-care. Excess weight places additional pressure on bony prominences, elevating the risk of pressure ulcers.
C. Inadequate nutritional intake. The client has a poor appetite and decreased oral intake, which can lead to protein and nutrient deficiencies. Poor nutrition impairs skin integrity and delays wound healing, further increasing the risk of pressure injuries.
D. Incontinence. The client wears an incontinence brief due to occasional urinary and fecal accidents. Constant exposure to moisture from urine and stool can break down the skin barrier, making it more susceptible to infections and pressure injuries.
E. Decreased sensory perception. The client reports neuropathy in both hands and lower legs, reducing sensation. Impaired sensation can prevent the recognition of pressure, pain, or injury, leading to delayed intervention and increased risk of skin breakdown.
F. Coarse lung sounds. While coarse lung sounds may indicate respiratory congestion or infection, they do not directly contribute to skin injury risk. This factor is less relevant compared to others affecting skin integrity.
G. Diabetes mellitus. The client has poorly controlled type 1 diabetes, which impairs circulation and delays wound healing. Chronic hyperglycemia can lead to reduced immune response and increased susceptibility to infections and pressure ulcers.
Correct Answer is C
Explanation
A. Scrambled eggs with roasted peppers and onions, lean ham, and toast. While peppers and onions provide antioxidants, the presence of processed meat (ham) increases the risk of some cancers, particularly colorectal cancer, due to nitrates and preservatives.
B. Pancakes with blueberries and maple syrup, and a turkey sausage patty. Blueberries are rich in antioxidants, which can help reduce cancer risk, but pancakes with syrup are high in refined carbohydrates and added sugars, which may contribute to inflammation and increased cancer risk.
C. Oatmeal with raisins and nuts, with skim milk and 1/2 grapefruit. Oatmeal contains fiber, which helps reduce the risk of colorectal cancer. Raisins and nuts provide antioxidants, while grapefruit is high in vitamin C, which supports immune function and may help protect against some cancers. This is the best balanced meal with cancer-protective nutrients.
D. Poached egg, bacon, biscuit, and canned peaches in light syrup. Bacon is a processed meat linked to an increased risk of colorectal cancer. Biscuits are refined carbohydrates, and canned peaches in syrup contain added sugars, which can contribute to inflammation and chronic disease risk.
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