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.
The parathyroid glands are four tiny glands, located in the neck, that control the body's calcium levels. Each gland is about the size of a grain of rice (weighs approximately 30 milligrams and is 3-4 millimeters in diameter). The parathyroids produce a hormone called parathyroid hormone (PTH). PTHPTH - parathyroid hormone raises the blood calcium level by: breaking down the bone (where most of the body's calcium is stored) and causing calcium release. increasing the body's ability to absorb calcium from food.
The anterior pituitary gland produces 6 hormones, they are: Growth hormones (GH) to the bones and muscles, thyrotropic hormones (TSH) to the thyroid, prolactin (PRL) to the mammary glands, adrenocorticotropic hormones (ACTH) to the adrenal cortex, follicle-stimulating hormones (FSH) and luteinizing hormones (LH) to the testes or ovaries.