The embryonic skeleton is made up of which kind of tissue?
fibrocartilage CT
hyaline cartilage CT
elastic CT
dense regular CT
elastic cartilage CT
The Correct Answer is B
A. fibrocartilage CT: Fibrocartilage is found in intervertebral discs and some joint areas, providing strong support and shock absorption, but it does not form the embryonic skeleton.
B. hyaline cartilage CT: The embryonic skeleton is primarily composed of hyaline cartilage, which provides a flexible template that allows growth and later ossification into bone during development.
C. elastic CT: Elastic connective tissue contains many elastic fibers, giving flexibility to structures like the lungs and large arteries, but it does not form the framework of the embryonic skeleton.
D. dense regular CT: Dense regular connective tissue forms tendons and ligaments with parallel collagen fibers, providing tensile strength, but it does not contribute to the embryonic skeletal framework.
E. elastic cartilage CT: Elastic cartilage is found in structures requiring flexible support, such as the ear and epiglottis, and is not the primary tissue of the embryonic skeleton.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum:This order goes from deepest to superficial. A needle would pierce the layers from superficial to deep, so this sequence is reversed.
B. stratum corneum, stratum granulosum, stratum spinosum, stratum basale:The epidermis is pierced from the outermost layer inward. The stratum corneum is the outer protective layer, followed by the stratum granulosum, stratum spinosum, and finally the stratum basale, which rests on the dermis.
C. stratum granulosum, stratum basale, stratum spinosum, stratum corneum:This order is not sequential either from superficial to deep or deep to superficial, so it does not represent the correct pathway for a needle entering the skin.
D. stratum basale, stratum spinosum, stratum granulosum, stratum corneum:This order lists the layers from deep to superficial, the opposite of how a needle would penetrate the epidermis.
Correct Answer is A
Explanation
A. accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer:Keratinocytes take up melanin granules produced by melanocytes and position them above the nucleus. This arrangement shields nuclear DNA from harmful UV radiation, reducing the risk of mutations and cellular damage.
B. provide the melanocyte with nutrients necessary for melanin synthesis:Nutrients for melanocyte function are delivered through blood supply in the dermis rather than directly by keratinocytes. Keratinocytes do not supply essential substrates for melanin production.
C. maintain the appropriate pH in order for the melanocyte to synthesize melanin granules:pH balance in the skin is regulated mainly by sweat and sebaceous secretions. Keratinocytes do not directly control melanocyte pH for melanin synthesis.
D. maintain the appropriate temperature so the product of the melanocyte will not denature:Temperature regulation is largely a function of dermal blood flow and sweat glands. Keratinocytes do not control melanocyte temperature or prevent denaturation of melanin.
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