What is the first threat to life from a massive third-degree burn?
dehydration
unbearable pain
loss of immune function
infection
The Correct Answer is A
A. dehydration: Massive third-degree burns destroy the skin barrier, allowing significant fluid loss through evaporation. This leads to hypovolemic shock, which is the most immediate and life-threatening concern after a severe burn.
B. unbearable pain: Third-degree burns often destroy nerve endings in the affected area, so pain may be minimal at the burn site itself. Pain is distressing but not the first life-threatening issue.
C. loss of immune function: Severe burns compromise the skin’s protective role, increasing susceptibility to infection. However, immune compromise develops over hours to days, making it a secondary threat compared to fluid loss.
D. infection: Infection is a major risk in burn patients due to the loss of the protective barrier, but it typically develops later. Immediate fluid loss poses a more urgent threat to life in the first hours following the burn.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. quantity of melanin produced:Ethnic variations in skin color are due to differences in the amount and type of melanin synthesized and distributed by melanocytes. While all humans have roughly the same number of melanocytes, the activity level of these cells determines pigment intensity.
B. quantity of hemoglobin in the blood:Hemoglobin contributes to skin tone by giving a reddish or pinkish hue, especially in lighter skin. However, it does not account for the baseline differences in ethnic skin color.
C. UV radiation exposure:Sun exposure can increase melanin production temporarily, leading to tanning. However, long-term ethnic differences are genetically determined rather than solely influenced by environmental UV exposure.
D. number of keratinocytes:Keratinocytes are the primary cells of the epidermis and act as recipients of melanin granules from melanocytes. Their number does not vary significantly among ethnic groups and does not explain differences in skin color.
E. number of melanocytes:The number of melanocytes is relatively consistent across all ethnicities. It is the rate of melanin synthesis and the type of melanin produced that create the observed differences in skin pigmentation.
Correct Answer is D
Explanation
A. always under voluntary control:Not all muscle tissue is under voluntary control. Skeletal muscle is voluntary, but cardiac and smooth muscles are involuntary, functioning independently of conscious control.
B. is a single-celled tissue:Muscle tissue is not composed of a single cell type. Skeletal muscle fibers are multinucleated, cardiac muscle cells are branched with intercalated discs, and smooth muscle cells are spindle-shaped, showing structural diversity.
C. cuboidal shape enhances function:Muscle cells are elongated, not cuboidal. Their elongated shape allows efficient contraction and force generation, which would not be possible with cuboidal-shaped cells.
D. highly cellular and well vascularized:Muscle tissue consists mostly of cells with minimal extracellular matrix and requires a rich blood supply to deliver oxygen and nutrients for sustained contraction, making this the accurate statement.
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