A nurse is assisting with teaching a newly licensed nurse about the loss of body heat. The nurse should include that heat loss that occurs when sweat dries on the skin is caused by which of the following mechanisms?
Convection
Evaporation
Conduction
Radiation
The Correct Answer is B
A: Convection involves the movement of air or liquid around the body, which then carries heat away but does not involve phase change like evaporation.
B: Evaporation is the process where liquid (sweat) turns into vapor, removing heat from the surface it evaporates from, which is the primary cooling mechanism in sweating.
C: Conduction involves direct transfer of heat through contact with cooler objects, not relevant to the drying of sweat.
D: Radiation refers to heat transfer through electromagnetic waves and does not require the presence of an intervening medium, unlike the evaporation of sweat.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A: Due to age-related reductions in gastrointestinal muscle efficiency, which slows the digestive process and can lead to increased water absorption from stool.
B: Overstates the issue, not all elderly patients experience difficulties, and it does not account for individual variability or other influencing factors like diet and medication.
C: Misrepresents the frequency and reasons for laxative use among the elderly, not all of whom misuse these medications.
D: While changes in rectal sphincter elasticity can affect some elderly individuals, it is less commonly a direct cause of constipation compared to decreased peristalsis.
Correct Answer is D
Explanation
A: The cuff should ideally cover about 80% of the circumference of the upper arm, not just 50%.
B: The cuff should be placed level with the client's heart, specifically aligned with the brachial artery for accurate measurement.
C: Elevating the arm above the level of the heart can lead to an inaccurately low reading.
D: Proper alignment with the brachial artery ensures that the sensor correctly detects the arterial pressure, crucial for accurate readings.
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