Which property of water is demonstrated when we sweat?
polar solvent properties
cushioning
reactivity
high heat capacity
high heat of vaporization
The Correct Answer is E
A. Polar solvent properties: Water’s polarity makes it an excellent solvent for ionic and polar substances, allowing chemical reactions to occur in the body. While this property is critical for metabolism, it is not related to the cooling effect of sweating.
B. Cushioning: Water provides cushioning by forming protective fluids such as cerebrospinal fluid and amniotic fluid, which absorb shocks. This protective role is important, but it does not explain how sweating helps regulate temperature.
C. Reactivity: Water participates in many chemical reactions, such as hydrolysis and dehydration synthesis. Although essential for metabolism, reactivity does not contribute to the cooling mechanism of sweating.
D. High heat capacity: Water resists temperature changes by absorbing or releasing large amounts of heat with minimal changes in its own temperature. This helps stabilize body temperature, but sweating specifically relies on a different property.
E. High heat of vaporization: Sweating demonstrates water’s high heat of vaporization, meaning it requires a significant amount of heat energy to change from liquid to vapor. As sweat evaporates from the skin, it absorbs body heat, producing a cooling effect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cholesterols: Cholesterol is a lipid molecule involved in cell membrane structure and as a precursor for steroid hormones, not as a catalyst for biochemical reactions.
B. Triglycerides: Triglycerides are fats used primarily for energy storage and insulation, and they do not function as enzymes.
C. Proteins: Most enzymes are proteins composed of amino acids. Their three-dimensional structure allows them to bind substrates and catalyze biochemical reactions efficiently, making them essential for metabolic processes.
D. Carbohydrates: Carbohydrates serve as energy sources and structural molecules but do not act as enzymes to catalyze reactions.
Correct Answer is A
Explanation
A. Contact: Contact signaling involves direct physical interaction between cell surface receptors and ligands on adjacent cells. This allows cells to recognize one another, which is crucial for tissue development, immune responses, and maintaining cellular organization.
B. Chemical: Chemical signaling involves the release of signaling molecules (like hormones or neurotransmitters) that travel to target cells, often over a distance. While important, it does not involve direct cell-to-cell recognition as contact signaling does.
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