Rock is considered an ecosystem because based on the definition of ecosystem. A rock is happens to be in our environment which makes it part of our ecosystem. 1 person found this useful.
Parathyroid hormone. Parathyroid hormone (PTH), also called parathormone or parathyrin, is a hormone secreted by the parathyroid glands that is important in bone remodeling, which is an ongoing process in which bone tissue is alternately resorbed and rebuilt over time. It essentially increases blood calcium levels.
The thyroid and parathyroid glands are situated close to each other in the front of the neck. The thyroid gland produces the hormone thyroxine (T 4) and its more active form, T 3, which act on body cells to regulate metabolism (the chemical reactions continually occurring in the body).Some thyroid cells secrete the hormone calcitonin, which lowers calcium in the blood.hyroid and parathyroid hormones. Iodine from the diet is used to make the hormones T 4 and T 3. These hormones are produced by the thyroid gland and regulate body metabolism. Parathyroid hormone (PTH) and, to a lesser extent, calcitonin regulate levels of calcium and phosphate.