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.
1 Thyroxine (T4) is the key hormone produced in the thyroid gland. 2  Low levels of T4 produce hypothyroidism, and high levels produce hyperthyroidism. 3  Thyroxine converts to triiodothyronine (T3), which is a more biologically active hormone.4  Only about 20% of triiodothyronine is actually formed in the thyroid gland. Thyroxine (T4) is the key hormone produced in the thyroid gland. 2  Low levels of T4 produce hypothyroidism, and high levels produce hyperthyroidism. 3  Thyroxine converts to triiodothyronine (T3), which is a more biologically active hormone.