How does a deficiency in intrinsic factor affect the body's ability to maintain adequate vitamin B12 levels?
It enhances the metabolism of vitamin B12 in the liver.
It leads to decreased absorption of vitamin B12, causing deficiency.
It boosts the storage of vitamin B12 in muscle tissues.
It increases the excretion of vitamin B12 through urine.
The Correct Answer is B
A. It enhances the metabolism of vitamin B12: Intrinsic factor is strictly for transport and absorption, not metabolism in the liver.
B. It leads to decreased absorption of vitamin B12, causing deficiency: Vitamin B12 cannot cross the intestinal lining in the ileum on its own; it must be bound to intrinsic factor to be recognized and absorbed.
C. It boosts the storage of vitamin B12 in muscle tissues: B12 is primarily stored in the liver, and intrinsic factor does not affect storage mechanisms.
D. It increases the excretion of vitamin B12 through urine: If B12 isn't absorbed, it is excreted in the stool, not the urine.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Provide a high-sodium diet: While increasing sodium intake may eventually be necessary, it is not the immediate priority for a patient showing neurological symptoms (confusion) from dilutional hyponatremia.
B. Administer hypotonic saline solution: Hypotonic solutions (like 0.45% NaCl) would further lower the sodium concentration, worsening the patient's condition and increasing the risk of cerebral edema.
C. Restrict oral fluid intake: A sodium level of 125 mEq/L indicates hyponatremia. The most common cause is fluid overload (dilutional hyponatremia). Restricting fluid helps prevent further dilution of the sodium remaining in the blood.
D. Encourage the patient to drink more water: This would worsen the hyponatremia by further diluting the extracellular sodium levels.
Correct Answer is A
Explanation
A. History of poor wound healing: High blood glucose levels impair circulation and immune function, leading to slow healing of cuts or sores.
B. Clammy skin: Cold, clammy skin is typically a sign of hypoglycemia, often called "insulin shock."
C. Random blood glucose 126 mg/dL: While slightly elevated for a fasting level, a random glucose of 126 is not high enough to be considered "hyperglycemic" in a diabetic client (usually >200 mg/dL for random testing).
D. Report of decreased urinary output: Hyperglycemia causes polyuria (increased urination) because the excess glucose acts as an osmotic diuretic.
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