Q:

Parathormone secretion is usually increased

safaTerkawi
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2022-08-17
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Parathormone secretion is usually increased.

  1. In patients with chronic renal failure.
  2. In people taking excessive amounts of vitamin D.
  3. In patients with anterior pituitary tumours secreting excessive amounts of its hormones.
  4. When blood phosphate levels fall.
  5. When plasma protein levels fall.
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safaTerkawi
2022-08-17
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A. True Phosphate retention results in a fall in the ionized calcium level in blood; this stimulates the parathyroid to produce more parathormone (secondary hyper-parathyroidism).

B. False The increased level of ionized calcium in blood depresses parathyroid activity.

C. False Pituitary hormones are not involved in the regulation of parathyroid activity.

D. False This raises ionized calcium levels and depresses parathyroid activity.

E. False This decreases the total blood calcium but not the ionized calcium level that reg-ulates parathormone secretion.

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