Land affected or burdened by an easement is called a servient estate, while the land or person benefited by the easement is known as the dominant estate.. If the easement benefits a particular piece of land, it is said to be appurtenant to the land.
Vitamin D obtained from sun exposure, food, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. The first occurs in the liver and converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as calcidiol.
Vitamin D plays a key role in absorbing calcium, especially in the context of keeping bones healthy. Vitamin D is made in the skin and then travels through the blood to the liver and then the kidneys. In the liver and kidneys, vitamin D is converted to its active form, often known as 1,25 vitamin D, that then sets off the production of compounds needed to absorb calcium in the intestine. It also acts on bones to make sure they are properly maintained.