Calcium and Phosphate Metabolism Practice Questions

Question 1

Which hormone is released when serum calcium levels decrease?

Accepted Answer

Parathormone

Answer

Calcitonin

Answer

Thyroxine

Answer

Adrenaline

Question 2

Tetany is seen in

Accepted Answer

Respiratory alkalosis

Answer

Respiratory acidosis

Answer

Metabolic acidosis

Answer

Hyperkalemia

Question 3

The most important regulator of serum 1,25(OH)2 vitamin D concentration is:

Accepted Answer

Parathyroid hormone

Answer

Calcium levels in serum

Answer

Magnesium levels in serum

Answer

25-hydroxyvitamin D in serum

Question 4

Secondary hyperparathyroidism due to Vit D deficiency shows :

Accepted Answer

Hypocalcemia

Answer

Hypophosphatemia

Answer

Hypercalcemia

Answer

Hyperphosphatemia

Question 5

All of the following statements are true except:

Accepted Answer

25(OH)D3 is the most active form of vitamin D

Answer

25–α hydroxylation takes place in liver

Answer

1–α hydroxylation takes place in kidney

Answer

Daily requirement in the absence of sun–light is 450-600 IU/day

Question 6

Proper evaluation of serum calcium level requires estimation of:

Accepted Answer

Serum albumin

Answer

Urinary output

Answer

Serum phosphorus

Answer

Serum potassium

Question 7

Site of 25-hydroxylation of cholecalciferol

Accepted Answer

Liver

Answer

Bone

Answer

Pancreas

Answer

Heart

Question 8

Hypocalcemia is characterized by all except

Accepted Answer

Shortening of Q-T interval in ECG

Answer

Carpopedal spasm

Answer

Hyperactive tendon reflexes

Answer

Numbness and tingling of circumoral region

Question 9

True about Parathyroid hormone:

Accepted Answer

Stimulates 1,25-D3 formation

Answer

Inhibits Ca2+ absorption from the intestines

Answer

It is steroidal in nature

Answer

All of the options

Question 10

Which of the following causes hypocalcemia:

Accepted Answer

Calcitonin

Answer

1, 25-dihydroxycholecalciferol

Answer

Parathormone

Answer

Thyroid hormones

Calcium and Phosphate Metabolism — MCQs

Calcium and Phosphate Metabolism — MCQs

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