The nurse is aware that vitamin B12 is absorbed in the:
Duodenum
Stomach
Small intestine
Large intestine
The Correct Answer is C
A. The duodenum is the first part of the small intestine where a significant amount of digestion takes place, but vitamin B12 is primarily absorbed in the lower part of the small intestine, called the ileum.
B. The stomach plays a role in releasing intrinsic factor, which helps in the absorption of vitamin B12, but the actual absorption occurs in the small intestine.
C. Vitamin B12 absorption primarily occurs in the lower part of the small intestine (ileum), facilitated by intrinsic factors.
D. The large intestine primarily absorbs water and electrolytes; it is not a site for vitamin B12 absorption.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Proteins and starches together are not represented as one-half of the MyPlate; they are grouped separately.
B. Half of the plate should be filled with fruits and vegetables, which provide vitamins, minerals, fiber, and antioxidants. The other half should be divided between grains and proteins, which provide carbohydrates, protein, iron, and B vitamins.
C. Dairy and fats are important but do not compose half of the MyPlate. Dairy is a separate food group on the plate.
D. Grains and starches are important but do not compose half of the plate according to the MyPlate plan.
Correct Answer is A
Explanation
A. Chronic alcohol use can impair the absorption and utilization of several vitamins, including B vitamins, leading to deficiencies.
B. Cystic fibrosis primarily affects the digestive system but is not directly associated with vitamin B deficiencies.
C. Phenytoin, an antiseizure medication, may interfere with vitamin D metabolism but is not strongly associated with vitamin B deficiencies.
D. Rifampin, an antibiotic used for tuberculosis, may interfere with the absorption of some nutrients, but it's not a primary concern for causing vitamin B deficiencies.
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