The________ layer of the epidermis consist of up to 30 layers of dead cells.
stratum spinosum
stratum basale
stratum corneum
stratum granulosum
The Correct Answer is C
A. stratum spinosum: This layer lies just above the stratum basale and is composed of keratinocytes that provide structural strength. While important for resilience, it does not contain multiple layers of dead cells.
B. stratum basale: This is the deepest epidermal layer consisting of a single row of basal cells that actively divide to form new keratinocytes. It contains living cells, not dead ones.
C. stratum corneum: The stratum corneum is the outermost layer of the epidermis, made up of up to 30 layers of flattened, dead keratinized cells. These cells provide a protective barrier against pathogens, water loss, and mechanical stress.
D. stratum granulosum: This layer lies beneath the stratum corneum and consists of keratinocytes beginning to die and fill with keratin. It does not contain as many layers as the stratum corneum and is not the thick, fully dead cell layer.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. mesothelium:Mesothelium is a specialized simple squamous epithelium that lines the serous membranes of body cavities, including the peritoneum, pleura, and pericardium. It provides a smooth, friction-reducing surface and facilitates the movement of organs within these cavities.
B. hyaline epithelium:Hyaline epithelium is not a recognized tissue type. Hyaline typically refers to cartilage, not epithelial tissue, and does not line serous membranes.
C. areolar CT:Areolar connective tissue is a loose connective tissue that supports and cushions organs, but it is not an epithelial layer and does not form the lining of serous membranes.
D. endothelium:Endothelium is a simple squamous epithelium that lines blood vessels and the heart, not serous cavities. It functions primarily in exchange of materials and maintaining vascular homeostasis.
Correct Answer is E
Explanation
A. areolar CT:Areolar connective tissue provides support and flexibility beneath epithelial layers but does not line tubular structures like the kidney tubules.
B. simple columnar ET:Simple columnar epithelium is specialized for absorption and secretion in areas like the gastrointestinal tract. Its taller cells are not suited for the thin, absorptive lining required in kidney tubules.
C. nonkeratinized stratified squamous ET:This epithelium protects against abrasion in areas such as the esophagus and oral cavity, but its multiple layers and thickness make it inappropriate for kidney tubules where rapid exchange occurs.
D. simple squamous ET:Simple squamous epithelium allows rapid diffusion and is found in structures like the glomerulus, but it is too thin for the majority of the kidney tubules, which require more absorptive and secretory capacity.
E. simple cuboidal ET:Simple cuboidal epithelium forms the lining of most kidney tubules. Its cube-shaped cells provide the surface area necessary for absorption and secretion while maintaining a single-cell layer for efficient transport of substances.
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