Loss of body heat that occurs through submersion in cold water is an example of which of the following?
Evaporation
Convection
Conduction
Radiation
The Correct Answer is C
A. Evaporation is the process by which heat is lost as a liquid (like sweat) turns into a gas. This is not applicable in the case of submersion in cold water, as evaporation only occurs when moisture is on the skin and exposed to air.
B. Convection refers to the transfer of heat through the movement of air or fluids. While cold water can create a convection effect on the body, the primary heat loss in water is due to conduction rather than convection.
C. Conduction is the direct transfer of heat from one substance to another through physical contact. When the body is submerged in cold water, heat is lost to the water through conduction, as the colder water draws heat away from the body.
D. Radiation refers to heat loss through infrared radiation, typically when the body releases heat into the surrounding air. This is not the primary method of heat loss in cold water.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. As previously noted, the length of the thoracic cavity increases, not decreases, during the contraction of inspiratory muscles.
B. The diaphragm moves downward (not upward) when it contracts, allowing the lungs to expand.
C. The contraction of the diaphragm and external intercostals increases the diameter of the thoracic cavity, providing space for the lungs to expand and fill with air. This is the correct answer.
D. The chest cavity does not compress the lungs during inspiration; instead, it expands to accommodate the lungs as they fill with air.
Correct Answer is A
Explanation
A. The plasma membrane, also known as the cell membrane, surrounds the entire cell and separates the cytoplasm from the external environment. It acts as a barrier, controlling the movement of substances into and out of the cell.
B. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids, but it does not enclose the cytoplasm. It is an internal organelle.
C. The endoplasmic reticulum (ER) is involved in protein and lipid synthesis and forms a network within the cytoplasm, but it does not enclose it. It works within the cell's internal structure.
D. The flagellum is a tail-like structure used for cell movement in some cells, but it does not enclose the cytoplasm.
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