Which of the following layers of the epidermis is where keratinization of the cells begins?
stratum basale
stratum lucidum
stratum spinosum
stratum corneum
The Correct Answer is C
A. stratum basale: This is the deepest layer of the epidermis, consisting of mitotically active basal cells. Its main function is cell division and replacement of superficial layers, not the initiation of keratinization.
B. stratum lucidum: This clear layer is found only in thick skin, such as the palms and soles. It contains densely packed keratin, but keratinization has already occurred before this stage.
C. stratum spinosum: Cells in this layer begin producing keratin and keratohyalin, initiating the process of keratinization. The spiny appearance of the cells is due to desmosomal attachments, which help strengthen the epidermis.
D. stratum corneum: This outermost layer is composed of fully keratinized, dead cells. By this stage, keratinization is complete, and cells are flattened, providing a protective barrier.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
True:Vellus hair is soft, fine, and lightly pigmented, covering much of the body surface. It is most noticeable in children and adult females, where it serves a protective function without providing significant insulation.
Correct Answer is B
Explanation
A. adipose CT:Adipose tissue primarily stores fat for energy and cushioning and does not provide the elasticity or vibration properties required for vocal cords.
B. elastic CT:Elastic connective tissue contains abundant elastic fibers, allowing the vocal cords to stretch and recoil during sound production. Its flexibility and resilience are essential for the rapid vibrations needed for speech.
C. areolar CT:Areolar tissue is a loose connective tissue that provides support and cushioning but lacks the dense elastic fibers necessary for vocal cord function.
D. elastic cartilage CT:Elastic cartilage provides flexible support in structures like the ear and epiglottis but is not the main tissue responsible for the vibration and elasticity of vocal cords.
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