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 A
Explanation
A. Older adults often experience decreased taste and smell sensitivity, leading to reduced appetite and interest in food.
B. While tissue repair might be needed, aging doesn't necessarily demand more calories solely for this purpose.
C. Taste preferences may change with age, but not necessarily a universal decrease in the taste for sweets.
D. Nutrient requirements may remain relatively stable or decrease due to changes in metabolism and decreased activity levels rather than solely due to cell loss.
Correct Answer is B
Explanation
A. The stomach is where food mixes with digestive juices and begins the process of breaking down, but it's not the initial site where food enters the gastrointestinal tract.
B. The mouth is where digestion begins as food is chewed and mixed with saliva, forming a bolus that starts the process of digestion before moving through the esophagus.
C. The rectum is the final portion of the large intestine where waste is stored before elimination, not the starting point of digestion.
D. The small intestine is the primary site of nutrient absorption but is not the starting point where food enters the gastrointestinal tract.
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