1. Why do pregnant women need calcium supplements? Calcium is one of the important elements for maintaining normal physiological functions of the human body. It is not only the main component of bones, but also participates in many important biological processes, such as nerve conduction, muscle contraction, blood coagulation, etc. During pregnancy, the development of fetal bones and teeth requires a large supply of calcium, so pregnant women need more calcium to meet these needs. In addition, pregnant women may also experience some problems during pregnancy, such as morning sickness, loss of appetite, etc., which will affect the absorption and utilization of nutrients. Therefore, adequate calcium supplementation is crucial to ensure the health of mothers and babies. 2. Which