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.
E) At all times, the adrenal gland monitors calcium levels in the blood and regulates calcium by secreting the two antagonistic hormones, epinephrine and norepinephrine. C) During stress, ACTH stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla.