Saturday, August 22, 2009
Why do we need Vitamin A
Vitamin A plays an important role in many vital functions of the human body. A well-known function of vitamin A is ensuring healthy vision. Besides, it is also required for bone growth, cell division, and cell differentiation. Vitamin A is also supposed to have enhancing effects on the immune system, as it produces disease-fighting white blood cells (WBCs), including lymphocytes. White blood cells are essential for preventing any kind of infection. Both retinol and retinoic acid play a significant role in embryonic development. Retinoic acid plays an important part in the formation of the heart, eyes, ears and limbs of the embryo. Vitamin A is essential for the healthy lining that covers the urinary, respiratory and intestinal tracts. The outer covering of these body systems provide protection against any infection. Vitamin A is also required for the growth of the thymus and spleen, for healthy tooth enamel and gums, for the repair of tissues and also for the reproductive system. Vitamin A plays a part in protein synthesis and reduces cholesterol.