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.
The PTH system provides long-term, day-to-day regulation of calcium levels by many hormones working in concert. This hormonal âfeedback loopâ is governed by the parathyroid glands and the calcitonin secreting cells of the thyroid gland by their constant monitoring of the blood calcium levels.pecial cells that reside in the thyroid gland along with thyroid hormone containing cells release another hormone, calcitonin, into the blood. Calcitonin signals osteoclasts to slow down removal of calcium from bone; this action tends to lower levels of blood calcium.