An infant with congenital hypothyroidism due to an underdeveloped thyroid gland was found to have an elevated level of thyroid-stimulating hormone (TSH). How can this be explained? Janet has been...

An infant with congenital hypothyroidism due to an underdeveloped thyroid gland was found to have an elevated level of thyroid-stimulating hormone (TSH). How can this be explained?

Janet has been diagnosed with osteoporosis, and her physician requests a blood test. Her blood results indicate excessive levels of calcium, and the physician suspects that Janet suffers from hyperparathyroidism. How can an overactive parathyroid gland cause osteoporosis?