Calcitonin is the other major hormone involved with calcium regulation. Parathyroid hormone (PTH), produced by the parathyroid gland, increases the level of calcium in the blo â¦ od. It usually accomplishes this by increasing the resorption rate (taking back) from bone.Calcitonin does the exact opposite and reduces calcium in the blood.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 Earth bulges slightly at the Equator; the average diameter of the Earth is 12,750 kilometres (7,922 mi), but the diameter at the Equator is about 43 kilometres (27 mi) greater than at the poles.
Centre of the Earth. 1  The equator is just under 25,000 miles long. 2  Because the Earth bulges at the centre the equator is the longest of our planet's five main circles of latitude, each one based on the relationship between the Earth's axis of rotation and the Earth's orbit around the sun.he Tropics. 1  By definition the latitude of the Earthâs equator is 0 degrees, while the Tropic of Cancer and the Tropic of Capricorn each lie at 23.5 degrees latitude.