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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Pernicious anemia is caused by vitamin B12 deficiency due to impaired absorption, not excessive destruction of erythrocytes.
B. Aplastic anemia results from the bone marrow's inability to produce enough blood cells, leading to a deficiency of all blood cell types, rather than the destruction of erythrocytes.
C. Immunohemolytic anemia is characterized by the immune system mistakenly attacking and destroying the body's own erythrocytes, leading to excessive destruction of red blood cells.
D. Iron-deficiency anemia is caused by insufficient iron to produce hemoglobin, resulting in low red blood cell production, but not excessive destruction of erythrocytes.
Correct Answer is B
Explanation
A. The parathyroid glands regulate calcium and phosphate levels in the blood through the release of parathyroid hormone (PTH), not testosterone.
B. The anterior pituitary gland regulates the release of testosterone through the secretion of luteinizing hormone (LH), which stimulates the testes to produce testosterone. This is the correct gland involved in testosterone regulation.
C. The posterior pituitary releases hormones like oxytocin and antidiuretic hormone (ADH), but it does not regulate testosterone production.
D. The thyroid gland is responsible for regulating metabolism through thyroid hormones (T3 and T4), not testosterone.
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