-Avit

Deficiency of this vitamin : 1- Night blindness presents when vit A status is marginal & with prolonged deficiency, changes to the cornea & conjunctiva occur. Theses changes collectively known as xerophthalmia, these changes consist of conjuctival xerosis, Bitot s spots, corneal xerosis, corneal ulceration & corneal scars. 2- very dry, rough skin may indicate a lack of vitamin A (follicular hyperkeratosis). 3- Immunity: vitamin A deficiency decrease resistance to infections, for ex: diarrhea,& respiratory infections. 4- vit A deficiency lead to nutritional deficiency anemia. 5-faulty tooth development, and slower bone growth.Deficiency of this vitamin : 1- Night blindness presents when vit A status is marginal & with prolonged deficiency, changes to the cornea & conjunctiva occur. Theses changes collectively known as xerophthalmia, these changes consist of conjuctival xerosis, Bitot s spots, corneal xerosis, corneal ulceration & corneal scars. 2- very dry, rough skin may indicate a lack of vitamin A (follicular hyperkeratosis). 3- Immunity: vitamin A deficiency decrease resistance to infections, for ex: diarrhea,& respiratory infections. 4- vit A deficiency lead to nutritional deficiency anemia. 5-faulty tooth development, and slower bone growth.