The rate of secretion of parathyroid hormone increases when A) serum Ca²⁺ levels increase. B) serum Ca²⁺ levels decrease. C) serum levels of TSH decrease. D) serum levels of TSH increase. E) serum levels of Na⁺levels increase.

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The rate of secretion of parathyroid hormone increases when serum calcium levels decrease. Parathyroid hormone (PTH) plays a crucial role in regulating calcium levels in the blood, and a decrease in serum calcium triggers its release to restore calcium balance by increasing calcium absorption from the kidneys, intestines, and bones.

The Rate of Secretion of Parathyroid Hormone Increases When