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Orthopedic MCQs Online Bank - Improve Your Knowledge and Skills

36. Clearance of parathormone occurs mainly through the:

1. A. Intestines
2. B. Liver
3. C. Kidney
4. D. Parathyroids
5. E. Thyroid
   Answer: B. Liver
   Clearance of parathormone occurs mainly through the liver.

37. The C-terminal of pathormone is cleared mainly in the:

1. A. Intestines
2. B. Liver
3. C. Kidney
4. D. Parathyroids
5. E. Thyroid
   Answer: C. Kidney
   The C-terminal of pathormone is cleared mainly in the kidney.

38. The main action of Vitamin D3 is on the:

1. A. Liver
2. B. Small intestine
3. C. Colon
4. D. Parathyroid gland
5. E. Thyroid gland
   Answer: B. Small intestine
   The main action of Vitamin D3 is on the small intestine.

39. Which of the following interferes most with the absorption of calcium from the intestine:

1. A. Diazepam
2. B. Chelating agents
3. C. Ergosterol
4. D. Heparin
5. E. Diuretics
   Answer: B. Chelating agents
   Chelating agents interfere most with the absorption of calcium from the intestine.

40. Phosphorous is absorbed into the body mainly through the:

1. A. Duodenum
2. B. Jejunum
3. C. Cecum
4. D. Colon
5. E. Stomach
   Answer: B. Jejunum
   Phosphorous is absorbed into the body mainly through the jejunum.

41. Which of the following is most likely to interfere with the absorption of phosphorous from the intestines:

1. A. Antacids
2. B. Bisphosphonates
3. C. Fluorine
4. D. Steroids
5. E. Heparin
   Answer: A. Antacids
   Antacids are most likely to interfere with the absorption of phosphorous from the intestines.

42. Which of the following peptide is secreted by the parafollicular cells of the thyroid gland:

1. A. Parathormone
2. B. Adrenaline
3. C. Noradrenaline
4. D. Calcitonin
5. E. Ergosterol
   Answer: D. Calcitonin
   Calcitonin is secreted by the parafollicular cells of the thyroid gland.

43. Which of the following when present, would result in shrinkage of the osteoclast:

1. A. Calcitonin
2. B. Parathormone
3. C. Prednisolone
4. D. Isoniazid
5. E. Methotrexate
   Answer: A. Calcitonin
   Calcitonin, when present, would result in shrinkage of the osteoclast.

44. PTHrP (parathormone related protein) is produced mainly in:

1. A. The liver
2. B. The kidney
3. C. The tumor
4. D. The lung
5. E. The parathyroid gland
   Answer: C. The tumor
   PTHrP (parathormone related protein) is produced mainly in the tumor.

45. Fibroblast Growth Factor 23 (FGF23) is the principal phosphaturic hormone and is produced by:

1. A. The osteoblast
2. B. The osteocyte
3. C. The osteoclast
4. D. The mesenchymal cells
5. E. The fibroblast
   Answer: B. The osteocyte
   Fibroblast Growth Factor 23 (FGF23) is the principal phosphaturic hormone and is produced by the osteocyte.
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