佝偻病是人体缺钙所致 ,维生素 D缺少是缺钙的重要原因。钙是人体必需的微量元素 ,居人体各种元素含量的第五位 ,其主要的生理作用是构成骨骼及牙齿、血液凝固、肌肉收缩、神经抑制等。人体缺钙是常见疾病 ,主要发生在四个时期即婴幼儿时期、青春发育期、妇女孕期及哺乳期、老 Rickets is caused by calcium deficiency in the body, lack of vitamin D is an important cause of calcium deficiency. Calcium is the human body essential trace elements, ranking fifth in the body of various elements, its main physiological role is the formation of bones and teeth, blood coagulation, muscle contraction, nerve inhibition. Calcium deficiency is a common disease in the human body, which mainly occurs in four periods: infancy, puberty, women during pregnancy and lactation, old