Final answer:
Chronic dysfunction of the parathyroid hormone refers to both hyperparathyroidism and hypoparathyroidism. Hyperparathyroidism is caused by overproduction of PTH, leading to weak bones and high blood calcium levels. Hypoparathyroidism is characterized by underproduction of PTH, causing low blood calcium levels and impaired muscle function.
Step-by-step explanation:
Chronic dysfunction of the parathyroid hormone can refer to both hyperparathyroidism and hypoparathyroidism. Hyperparathyroidism is caused by an overproduction of parathyroid hormone, leading to excessive calcium reabsorption from bone and high blood calcium levels. This can result in weak bones, fractures, and nervous system impairment. Hypoparathyroidism, on the other hand, is characterized by underproduction of PTH, causing low blood calcium levels and muscle function impairment.