1 The phenotype may change constantly throughout the life of an individual because of environmental changes and the physiological and morphological changes associated with aging.
What is parathyroid hormone? Parathyroid hormone is secreted from the four parathyroid glands, which are small glands in the neck, located behind the thyroid gland. Parathyroid hormone regulates calcium levels in the blood, largely by increasing the levels when they are too low.It does this through its actions on the kidneys, bones and intestine:hat is parathyroid hormone? Parathyroid hormone is secreted from the four parathyroid glands, which are small glands in the neck, located behind the thyroid gland. Parathyroid hormone regulates calcium levels in the blood, largely by increasing the levels when they are too low.
1 Adrenocorticotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol. 2  Growth hormone, which regulates growth, metabolism and body composition. 3  Luteinising hormone and follicle stimulating hormone, also known as gonadotrophins.rolactin, which stimulates milk production Thyroid stimulating hormone, which stimulates the thyroid gland to secrete thyroid hormones. There are also some hormones that are produced by the hypothalamus and then stored in the posterior pituitary gland prior to being released into the bloodstream.