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A needle would pierce the epidermal layers of the brachial region in which order?

A.

stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

B.

stratum corneum, stratum granulosum, stratum spinosum, stratum basale

C.

stratum granulosum, stratum basale, stratum spinosum, stratum corneum

D.

statum basale, stratum spinosum, stratum granulosum, stratum corneum

Answer and Explanation

The Correct Answer is B

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.


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Related Questions

Correct Answer is C

Explanation

A. G1 (gap 1):During G1, the cell grows and performs normal metabolic activities. Organelles are duplicated, but DNA replication does not occur in this phase.

B. G2 (gap 2):G2 follows DNA synthesis and involves further cell growth and preparation for mitosis, including the production of proteins needed for cell division. DNA replication has already been completed by this point.

C. S (synthesis):The S phase is dedicated to DNA replication. Each chromosome is duplicated to ensure that the resulting daughter cells receive an identical copy of the genetic material.

D. metaphase:Metaphase is a stage of mitosis, not interphase. During metaphase, replicated chromosomes align at the cell’s equatorial plane in preparation for separation.

Correct Answer is B

Explanation

False:On mRNA, three sequential nucleotides are referred to as a codon. Codons are read during translation to direct the incorporation of specific amino acids into a growing polypeptide chain. A triplet refers to three sequential bases on DNA, which together code for one amino acid. This terminology applies specifically to DNA rather than mRNA.

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