The following statement about calcium absorption from small intestine are true except:
A)It occurs by active transport.
B)It requires vit. D and parathormone.
C)It occours by passive diffusion from upper small intestine.
D)It is decreased by excess phosphate and oxalate in food.

Question

Quizplus · Accepted Answer

Calcium absorption primarily occurs in the duodenum and proximal jejunum of the small intestine and is facilitated by active transport mechanisms, especially under the influence of vitamin D. While passive diffusion does occur, it is not limited to the upper small intestine and is not the primary mechanism. Excess phosphate and oxalate can indeed decrease calcium absorption by forming insoluble complexes with calcium.

The Following Statement About Calcium Absorption from Small Intestine Are