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 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.
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