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 C
Explanation
A. Dedicated breastfeeding for 6 months. Exclusive breastfeeding for at least 6 months is recommended by the American Academy of Pediatrics (AAP) and is associated with a lower risk of childhood obesity. Breastfeeding helps regulate appetite and metabolism.
B. Consumption of whole milk as a toddler. Whole milk is recommended from ages 1 to 2 years for brain development and growth. While excessive milk intake may contribute to weight gain, it is not a primary risk factor for early childhood obesity.
C. Introduction of fortified cereal before 4 months of age. Introducing solid foods before 4 months is linked to an increased risk of childhood obesity. Early introduction may disrupt natural hunger and satiety cues, leading to overeating later in life. The AAP recommends introducing solid foods around 6 months of age.
D. Exclusive soy-based formula for the first year of life. Soy-based formula is nutritionally comparable to cow's milk-based formula. While formula feeding in general has been associated with a slightly higher risk of obesity than breastfeeding, soy formula itself is not a direct risk factor for obesity.
Correct Answer is A
Explanation
A. Thyroxine (T4). Congenital hypothyroidism is diagnosed by measuring low levels of thyroxine (T4) and elevated thyroid-stimulating hormone (TSH). Infants with hypothyroidism have delayed metabolism, poor growth, and developmental delays. Reporting low T4 levels is critical for early treatment with levothyroxine to prevent intellectual disability and growth impairment.
B. Growth hormone (GH) levels. While GH is important for growth, it is not the primary diagnostic test for congenital hypothyroidism. GH deficiency is a separate endocrine disorder.
C. Follicle-stimulating hormone (FSH) levels. FSH is involved in reproductive development and is not relevant for diagnosing hypothyroidism in an infant.
D. Luteinizing hormone (LH) levels. LH plays a role in pubertal development and reproductive function, but it is not used to diagnose congenital hypothyroidism.
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