College of Massage Therapists of British Columbia (CMTBC) Practice Exam

What aids in the absorption of calcium in the gastrointestinal tract?

1. Vitamin K

2. Vitamin D

3. Magnesium

4. Carbohydrates

The correct answer is: Vitamin D

Vitamin D plays a crucial role in the absorption of calcium in the gastrointestinal tract. It enhances the intestinal absorption of calcium by promoting the synthesis of calcium-binding proteins within the gut lining. When vitamin D is present, the efficiency with which the intestines absorb calcium increases significantly, ensuring that adequate amounts of calcium enter the bloodstream for various bodily functions, including bone health. In contrast, while Vitamin K is important for bone metabolism and helps in the utilization of calcium within bones, it does not directly facilitate its absorption from the gastrointestinal tract. Magnesium is also important for calcium metabolism and helps maintain normal levels of calcium in the blood, but it does not directly aid in its absorption. Carbohydrates provide energy and are important for overall health, but they do not have a direct role in calcium absorption. Therefore, vitamin D is the key nutrient that supports the effective uptake of calcium from the gastrointestinal tract.