In fact, the first laser that was assembled in 1954 using a source of microwaves to energize or stimulate the electrons in a cloud of ammonia and form a coherent beam of light. It was called a MASER or microwave amplified by stimulated emission of radiation.
The parathyroid glands produce hormones that regulate calcium levels. Calcitonin produced by the thyroid gland, and PTH produced by the parathyroid gland.arathyroid hormone (PTH) and calcitonin regulate blood calcium levels. PTH increases the calcium concentration in the blood, and calcitonin decreases it. 2 people found this useful. Edit.
PTH regulates how much calcium is absorbed from your diet, how much calcium is excreted by your kidneys, and how much calcium is stored in your bones. We store many pounds of calcium in our bones, and it is readily available to the rest of the body at the request of the parathyroid glands. PTH increases the formation of active vitamin D, and it is active vitamin D that increases intestinal calcium and phosphorus absorption.