Define sources and function of Vitamin A, B1, B2, B6,B12, Vitamin C, D, K and write deficiency disease?
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vitamin A
Vitamin A has many important functions in your body. It helps regulate your immune system, helps form and maintain healthy teeth, skin, and tissue, it produces the pigments in the retina of the eye, and promotes good vision. A deficiency in this vitamin can lead to problems with any of these. The vitamin A found in plants serves different functions than the vitamin A found in animals. The animal sources of vitamin A are liver, whole milk, and fortified foods, and the plant sources include colorful fruits and vegetables like carrots, spinach, kale, and cantaloupe.
vitamin b
Vitamin B1 is most commonly known as thiamin. It is involved in numerous body functions, including metabolism of carbohydrates, assisting with muscle functioning, producing hydrochloric acid, and assisting with nervous system functioning. A deficiency can cause weakness, fatigue, nerve damage, and psychosis. When the deficiency becomes severe, it causes a disease known as beriberi. There are many foods that provide thiamin so it's easy to get enough from your diet. Some of these foods are beans, pork, fortified cereal, and enriched rice.
vitamin b2
Vitamin B2 is most commonly known as riboflavin. It is needed for converting food to energy, to work as an antioxidant by scavenging damaging free radicals, and to convert vitamin B6 and folate into active forms. Most people meet their needs with a balanced diet. Good sources of riboflavin are milk, spinach, fortified cereal, eggs, and green vegetables. You can be deficient in riboflavin when you don't consume enough riboflavin, but other things that can cause a deficiency are malabsorption syndromes, chronic diarrhea, long-term use of barbiturates, peritoneal dialysis, and alcoholism
vitamin b6
Vitamin B6 comes in three forms and plays a role in red blood cell metabolism, making hemoglobin, assisting in the proper functioning of the nervous and immune systems, taking part in protein metabolism, and making the neurotransmitters serotonin and norepinephrine. It is found in many foods so it's easy to consume enough through your diet. Some foods that contain vitamin B6 are bananas, potatoes, chicken breast, garbanzo beans, seeds, and roast
Vitamin B12
Vitamin B12 is a very important water-soluble vitamin. It is needed for producing and maintaining new cells (nerve and red blood cells) and for making DNA. Without enough vitamin B12, you are at risk for pernicious anemia. The symptoms of B12 deficiency are fatigue, constipation, weakness, loss of appetite, weight loss, and numbness and tingling in the hands and feet. You may also experience a difficulty in maintaining balance, confusion, dementia, depression, and poor memory. Fortunately, you can get enough in your diet by consuming animal foods like beef, salmon, trout, tuna, chicken, eggs, and yogurt. You can also get it from fortified cereals.