True statement about Ca++ absorption from intestines is:-
Major absorption occurs in the ileum
It occurs mainly the para cellular pathway
It occurs by active transpo
It is facilitated by phosphates in diet
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).
Gastrointestinal System