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. a segment of DNA that carries the instructions for one protein:A gene is a functional unit of DNA that contains the necessary coding sequence to produce a specific protein. It includes exons, which code for amino acids, and regulatory regions that control expression.
B. a strand of introns only:Introns are non-coding segments within a gene that are removed during RNA processing. A gene is not composed solely of introns, as it also contains exons that determine protein structure.
C. an RNA messenger that codes for a particular polypeptide:Messenger RNA is the transcript produced from a gene. While it carries the code for a protein, the gene itself is the DNA sequence, not the RNA product.
D. a three-base triplet that specifies a particular amino acid:A three-base triplet is a codon in mRNA, which specifies a single amino acid during translation. A gene consists of many codons and encompasses the full sequence necessary for the entire protein.
Correct Answer is E
Explanation
A. Melanocytes:Melanocytes are specialized cells that produce melanin to protect against UV radiation. They do not function as sensory receptors and are not involved in touch sensation.
B. Keratinocytes:Keratinocytes form the majority of the epidermis and provide a protective barrier. While they interact with other skin cells, they do not detect sensory stimuli.
C. Adipocytes:Adipocytes are fat cells located in the subcutaneous layer. They serve as energy storage and insulation but are not involved in sensing touch.
D. Dendritic cells:Dendritic cells are immune cells in the skin that detect pathogens and present antigens. They play a role in immune defense rather than tactile sensation.
E. Tactile cells:Tactile cells, also known as Merkel cells, are specialized mechanoreceptors located in the basal layer of the epidermis. They detect light touch and pressure, transmitting sensory information to sensory neurons.
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