Dermal folds at or near joints on the wrist are examples of
a cutaneous plexus
cleavage lines
flexure lines
friction ridges
The Correct Answer is C
A. a cutaneous plexus: The cutaneous plexus is a network of blood vessels located in the dermis that supplies nutrients to the skin. It is not related to the formation of dermal folds or lines at joints.
B. cleavage lines: Cleavage lines, or tension lines, indicate the natural orientation of collagen fibers in the dermis. They guide surgical incisions for optimal healing but do not specifically form at joint folds.
C. flexure lines: Flexure lines are dermal folds that occur at or near joints, such as the wrist, fingers, and elbows. They allow the skin to bend and stretch without tearing, forming permanent creases where the skin is tightly bound to underlying structures.
D. friction ridges: Friction ridges are the raised patterns on the fingers, palms, and soles that enhance grip. They are not associated with joint folds or skin creases.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Nonkeratinized stratified squamous:This epithelium type is found in areas subject to friction and abrasion, such as the esophagus and oral cavity. Its multiple layers make it unsuitable for efficient gas exchange, as diffusion is slowed by the thickness of the tissue.
B. Simple columnar:Simple columnar epithelium is specialized for absorption and secretion, commonly found in the gastrointestinal tract. Its tall cell structure is not ideal for rapid diffusion, making it poorly suited for alveolar gas exchange.
C. Simple squamous:Simple squamous epithelium consists of a single, thin layer of flat cells. Its delicate structure provides a minimal barrier for diffusion, allowing oxygen and carbon dioxide to rapidly pass through the alveolar walls during respiration.
D. Simple cuboidal:Simple cuboidal epithelium is found in glands and kidney tubules where secretion and absorption occur. Its cube-shaped cells are thicker than squamous cells, creating a greater distance for gases to diffuse, which reduces efficiency in the lungs.
Correct Answer is A
Explanation
A. accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer:Keratinocytes take up melanin granules produced by melanocytes and position them above the nucleus. This arrangement shields nuclear DNA from harmful UV radiation, reducing the risk of mutations and cellular damage.
B. provide the melanocyte with nutrients necessary for melanin synthesis:Nutrients for melanocyte function are delivered through blood supply in the dermis rather than directly by keratinocytes. Keratinocytes do not supply essential substrates for melanin production.
C. maintain the appropriate pH in order for the melanocyte to synthesize melanin granules:pH balance in the skin is regulated mainly by sweat and sebaceous secretions. Keratinocytes do not directly control melanocyte pH for melanin synthesis.
D. maintain the appropriate temperature so the product of the melanocyte will not denature:Temperature regulation is largely a function of dermal blood flow and sweat glands. Keratinocytes do not control melanocyte temperature or prevent denaturation of melanin.
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