Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes
accumulate the melanin granules on their superficial portion, forming a UV- blocking pigment layer
provide the melanocyte with nutrients necessary for melanin synthesis
maintain the appropriate pH in order for the melanocyte to synthesize melanin granules
maintain the appropriate temperature so the product of the melanocyte will not denature
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. cartilage CT:Cartilage connective tissue provides structural support in joints, the respiratory tract, and the ear, but it is not a component of spleen or lymph nodes, which require a softer supportive framework.
B. reticular CT:Reticular connective tissue forms a delicate, branching network of fibers that supports lymphocytes and other immune cells in organs like the spleen and lymph nodes. This framework helps filter body fluids and supports immune function.
C. adipose CT:Adipose connective tissue stores energy and provides insulation and cushioning. While it may surround organs, it does not form the internal supportive framework of lymphatic organs.
D. smooth MT:Smooth muscle tissue is found in the walls of hollow organs, blood vessels, and the digestive tract. It plays a role in involuntary movement, not in forming the supportive structure of lymphoid organs.
Correct Answer is D
Explanation
A. late prophase:During late prophase, chromosomes condense and the mitotic spindle forms, but cytokinesis has not yet begun as the cell is still preparing for chromosome alignment.
B. early anaphase:Early anaphase involves the separation of sister chromatids toward opposite poles. Cytokinesis does not start at this point because chromosome separation is still in progress.
C. early prophase:Early prophase is the initial stage of mitosis where chromatin condenses into visible chromosomes. Cytokinesis is not initiated at this stage.
D. late anaphase:Cytokinesis begins during late anaphase, when the cell starts forming a cleavage furrow as the chromosomes near the poles. This process continues into telophase, ultimately dividing the cytoplasm into two daughter cells.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.