Fred the Fireman burned his left arm during a recent heroic rescue. The most important epidermal stratum involved in healing by regeneration of new skin is the:
stratum basale
stratum lucidum
stratum corneum
stratum granulosum
The Correct Answer is A
A. stratum basale
This is the deepest layer of the epidermis, and it contains mitotically active basal cells that regenerate the epidermis after injury.
B. stratum lucidum
This is a thin, transparent layer found only in thick skin (palms and soles). It does not contribute to regeneration.
C. stratum corneum
This is the outermost layer made of dead keratinized cells. It provides protection but does not regenerate tissue.
D. stratum granulosum
This layer helps in keratin formation but does not contain actively dividing cells and plays no major role in regeneration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. growth hormone
Deficiency in GH during childhood leads to dwarfism or delayed growth, so it’s definitely a suspect in short stature.
B. thyroid hormone
Thyroid hormone plays a critical role in metabolism and skeletal growth. Its deficiency can cause growth delays.
C. sex hormones
Estrogen and testosterone influence growth plate closure and stimulate growth during puberty. Imbalance can lead to short stature or delayed puberty.
D. calcitonin
Calcitonin helps regulate calcium levels, but it has a minor role in growth. Deficiency or excess does not cause short stature.
Correct Answer is B
Explanation
A. ground substance
This is a major component of the ECM, consisting of water, proteoglycans, and glycoproteins that fill the space between fibers and cells.
B. cytoplasmic inclusions
These are structures found inside the cell (e.g., glycogen granules, lipid droplets), not in the extracellular matrix.
C. fluid
Interstitial fluid (extracellular fluid) is part of the ECM and facilitates nutrient and waste exchange.
D. protein fibers
Collagen, elastic, and reticular fibers are key components of the ECM that provide strength, flexibility, and support.
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