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小儿维生素A缺乏病是因维生素A缺乏引起的小儿全身性疾病。维生素A在人体内的主要功能有如下几个方面:①构成视觉细胞的感光物质,以维持暗光下的视觉功能:②维持细胞膜的稳定性,以确保上皮细胞或粘膜上皮细胞的完整性:③促进骨骼(牙齿)的生长:④增强机体免疫功能:⑤维持正常生殖功能。维生素A缺乏的原因有:①饮食不当。胎儿肝内储存的维生素A很少,生后很快被耗尽。母乳喂养的婴儿可从初乳中获得大量维生紊A,但如无母乳或奶量不足时,仍可引发亚临床型维生素A缺乏病。在断
Pediatric vitamin A deficiency is due to vitamin A deficiency caused by pediatric systemic disease. The main functions of vitamin A in the human body are the following aspects: ① constitute the photosensitive cells of visual cells to maintain the visual function of dark light: ② maintain the stability of the cell membrane to ensure the integrity of epithelial cells or mucosal epithelial cells: ③ promote bone (tooth) growth: ④ enhance immune function: ⑤ maintain normal reproductive function. The reasons for lack of vitamin A: ① improper diet. Little storage of fetal liver vitamin A, soon after use is depleted. Breastfeeding babies get a lot of vitamin A from colostrum, but can still cause subclinical vitamin A deficiency in the absence of breast milk or milk. Broken