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. The jejunum is the middle part of the small intestine and is primarily involved in nutrient absorption, but it does not receive bile from the common bile duct.
B. The ileum is the final part of the small intestine, responsible for absorbing bile salts and vitamin B12, but it does not directly receive bile from the common bile duct.
C. The common bile duct empties bile into the duodenum, which is the first part of the small intestine. This allows bile to aid in the digestion and emulsification of fats.
D. The stomach is involved in the digestion of food but does not receive bile directly. Bile enters the small intestine, not the stomach
Correct Answer is B
Explanation
A. While phagocytes can move to areas of damage, their primary function is not to clump together and adhere to tissues, but rather to engulf and digest foreign materials.
B. Phagocytes, such as macrophages and neutrophils, are specialized white blood cells that ingest and digest foreign pathogens, dead cells, and debris within damaged tissues. This is their main characteristic and function.
C. The release of histamine is typically associated with mast cells, not phagocytes. Histamine helps to initiate inflammatory responses, but phagocytes are involved in engulfing pathogens rather than releasing histamine.
D. Transporting oxygen from the lungs to tissues is the role of red blood cells, not phagocytes. Phagocytes are involved in immune defense, not oxygen transport.
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