Magnesium Metabolism Practice Questions

Question 1

A woman with eclampsia is started on magnesium sulfate. What is the first sign of magnesium sulfate toxicity?

Accepted Answer

Loss of knee jerk

Answer

Respiratory depression

Answer

Hypotension

Answer

Reduced muscle tone

Question 2

Which enzyme requires zinc as a cofactor?

Accepted Answer

Carbonic anhydrase

Answer

Lactate dehydrogenase

Answer

Glutathione peroxidase

Answer

Hexokinase

Question 3

Hypomagnesemia due to increased excretion by the kidney is caused by all except:

Accepted Answer

Digitalis

Answer

Aminoglycoside

Answer

Furosemide

Answer

Cisplatin

Question 4

Hypermagnesemia may be observed in:

Accepted Answer

Acute Kidney Injury

Answer

Hypothyroidism

Answer

Primary hypoparathyroidism

Answer

Adrenal insufficiency

Question 5

Normal anion gap is___ mmol/L?

Accepted Answer

8-16

Answer

30-34

Answer

20-24

Answer

0-4

Question 6

In Bartter's syndrome there is a defect in

Accepted Answer

Thick ascending limb of LOH

Answer

Descending limb of LOH

Answer

DCT

Answer

PCT

Question 7

In renal failure, what is the primary cause of metabolic acidosis?

Accepted Answer

Decreased excretion of acids

Answer

Use of diuretics

Answer

Loss of HCO3-

Answer

Increased H+ production

Question 8

Which of the following statements is not true?

Accepted Answer

The unionized fraction of calcium in the plasma is an important determinant of PTH secretion

Answer

Mg2+ deficiency impairs PTH secretion and can lead to hypocalcemia

Answer

Parathyroid hormone-related protein is responsible for causing hypercalcemia in cancer patients

Answer

Ca2+ influences PTH secretion by acting on a calcium sensor G-protein coupled receptor located in the parathyroid gland

Question 9

In a child with suspected tetany, the following test is performed. Identify the sign?

Accepted Answer

Trousseau sign

Answer

Chvostek sign

Answer

Allen sign

Answer

Turner sign

Question 10

Intracellular water constitutes what percentage of total body water?

Accepted Answer

60%

Answer

25%

Answer

80%

Answer

40%

Magnesium Metabolism — MCQs

Magnesium Metabolism — MCQs

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