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 anterior pituitary gland produces the following hormones and releases them into the bloodstream: 1  Adrenocorticotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol. 2  Growth hormone, which regulates growth, metabolism and body composition.