<prompt> True statement about Ca absorption from intestines is:-Major absorption occurs in the ileumIt occurs mainly the para cellular pathwayIt occurs by active transpoIt is facilitated by phosphates in diet  <response>: Calcium ions are actively absorbed into the blood, especially from the duodenum, and the amount of Ca ion absorption is exactly controlled to supply the daily need of the body for calcium. One impoant factor controlling Ca absorption : Parathyroid hormone Vitamin - D. PTH - vitamin D PTH activates vitamin D, the activated vitamin D in turn greatly enhances Ca absorption. 