Which of the following vitamins is synthesized in the skin?
B12
D
A
K
The Correct Answer is B
A. Vitamin B12 is not synthesized in the skin. It is primarily absorbed through the digestive system from dietary sources such as meat and dairy products.
B. Vitamin D is synthesized in the skin when exposed to sunlight, specifically ultraviolet B (UVB) radiation, which triggers the production of vitamin D3, a precursor to the active form of vitamin D.
C. Vitamin A is obtained from dietary sources, such as fruits and vegetables, and is not synthesized in the skin.
D. Vitamin K is primarily absorbed from food and produced by bacteria in the intestines, not synthesized in the skin.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Hydrochloric acid is a strong acid produced in the stomach to aid in digestion, not a byproduct of glucose breakdown.
B. Ketotic acid is produced in conditions where fat metabolism predominates, especially during ketosis, not during anaerobic glucose breakdown.
C. Carbonic acid forms when carbon dioxide dissolves in water and is not related to glucose metabolism.
D. Lactic acid is produced during anaerobic respiration when glucose is broken down without sufficient oxygen. This occurs in muscles during intense exercise, leading to the accumulation of lactic acid, which causes the sensation of muscle fatigue. This is the correct answer.
Correct Answer is C
Explanation
A. Peristalsis, the movement of food through the digestive tract, is inhibited by sympathetic stimulation. The "fight-or-flight" response prioritizes immediate physical needs over digestion, decreasing peristalsis.
B. Bladder tone decreases with sympathetic stimulation. The sympathetic nervous system causes the bladder to relax, inhibiting urination in stressful situations.
C. Heart rate increases with sympathetic stimulation. The sympathetic nervous system activates the "fight-or-flight" response, which includes increasing heart rate to supply more oxygen and nutrients to muscles.
D. Saliva production decreases with sympathetic stimulation. During stress or danger, the body reduces non-essential activities like salivation to focus on more critical survival functions.
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