Which lipid is part of vitamin D?
Glycerol
Steroids
Prostaglandins
Fatty acids
The Correct Answer is B
A. Glycerol: This is a component of triglycerides, not Vitamin D.
B. Steroids: Vitamin D is a fat-soluble vitamin synthesized from cholesterol (a steroid) in the skin when exposed to UV light.
C. Prostaglandins: These are tissue hormones derived from fatty acids, not vitamins.
D. Fatty acids: While Vitamin D is fat-soluble, its chemical structure is classified as a secosteroid.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Back of the hand: This area has "thin skin" with a relatively thin stratum corneum.
B. Thigh: This is also considered thin skin.
C. Abdomen: This is standard thin skin.
D. Sole of the foot: The soles of the feet and the palms of the hands consist of "thick skin," which has a significantly expanded stratum corneum to protect against high friction and pressure.
Correct Answer is B
Explanation
A. a constant state maintained by living and nonliving organisms: Nonliving organisms do not maintain homeostasis.
B. a state of relative constancy: Homeostasis is not a "fixed" point but a dynamic equilibrium where variables fluctuate within a narrow, healthy range.
C. adaptation to the external environment: This is a broader biological concept; homeostasis is specifically about maintaining the internal environment.
D. changes in body temperature: This is just one example of a homeostatic variable, not the definition of the concept itself.
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