Identify three ways vitamin D helps to maintain blood concentrations of calcium and phosphorus
Vitamin D's special role in bone health is to assist in the absorption of calcium and phosphorus, thus helping to maintain blood concentrations of these minerals. The bones grow denser and stronger as they absorb and deposit these minerals.
Vitamin D raises blood concentrations of bone minerals in three ways. When the diet is sufficient, vitamin D enhances their absorption from the GI tract. When the diet is insufficient, vitamin D provides the needed minerals from other sources: reabsorption by the kidneys and mobilization from the bones into the blood. The vitamin may work alone, as it does in the GI tract, or in combination with parathyroid hormone, as it does in the bones and kidneys.
You might also like to view...
Sam has been diagnosed with esophageal dysphagia. This means that he has ____
A) difficulty passing a bolus of food through the esophagus into the stomach B) coughing during swallowing C) an inability to initiate swallowing D) excessive secretion of saliva
Risk factors for osteoporosis include _____.
A. excess calcium intake B. moderate alcohol consumption C. being overweight D. sarcopenia E. high levels of testosterone
An increased requirement for _____ during pregnancy is related to their roles in the synthesis of red blood cells
a. calcium and vitamin K b. vitamin E and vitamin C c. folate and vitamin B12 d. protein and calcium
The peptide bonds that join amino acids together to form proteins are the result of a _____ reaction
a. hydrolysis b. catabolic c. condensation d. synthetic