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.
Thyroid Hormones (T3 and T4) Triiodothyronine (T3) and thyroxine (T4) are the hormones produced by your thyroid gland. T4 is produced in a much larger amount and is then converted to T3, the active form of the hormone, as needed to up-regulate metabolic functions.