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 C
Explanation
A. Suppressed red blood cell count is typically associated with conditions like anemia or bone marrow issues, not directly with pancreatic dysfunction.
B. Elevated cholesterol levels may result from metabolic conditions, but they are not a primary consequence of pancreatic dysfunction.
C. Elevated blood sugar is a primary result of pancreatic dysfunction, especially in cases like diabetes mellitus, where the pancreas does not produce enough insulin or the body becomes resistant to insulin.
D. Suppressed immune system is not a direct result of pancreatic dysfunction. However, chronic conditions such as diabetes can affect immune function over time, but it is not the primary effect.
Correct Answer is A
Explanation
A. The spleen is a key component of the lymphatic system. It filters blood, removes old or damaged blood cells, and plays a role in immune function by storing white blood cells that fight infection.
B. The thyroid gland is an endocrine gland involved in regulating metabolism through the production of thyroid hormones, but it is not part of the lymphatic system.
C. The adrenal glands are also endocrine glands responsible for producing hormones like adrenaline and cortisol. They are not part of the lymphatic system.
D. The pancreas is an organ involved in digestion and blood sugar regulation through insulin production. It does not function within the lymphatic system.
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