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.
Therefore, to determine the circumference from the diameter given above: equitorial diameter x 3.141592 = equitorial circumference | | 7,926 x 3.141592 = 24,900 | | The earth has a circumference of approximately 24,900 miles. More precisely the circumference of the earth at the equator is 24,902 mi / 40,076 km.