b) Briefly discuss the role of vitamin A in the visual cycle and the role of
vitamin D in absorption of calcium in our today.
ANS-Vitamins are essential nutrients that your body needs in small amounts to function. They fall into two categories: water-soluble and fat-soluble. The water-soluble vitamins - C and the B-complex vitamins - dissolve in water before your body can absorb them. Fat-soluble vitamins - A, D, E, and K - dissolve in fat and can be stored in your liver and fat tissue until needed. Fat-soluble vitamins have a multitude of functions from keeping your bones strong to helping your muscles move.
Vitamin A helps your vision, immune, and reproductive systems. It is essential to bone growth and tooth development. It also keeps your heart, lungs and kidneys working properly.
Vitamin D, along with calcium, keeps your bones strong by preventing diseases such as rickets, a disorder that causes bones to become soft and weak in children. It also helps prevent osteoporosis, which makes your bones weak and more likely to break. Vitamin D also helps your muscles move, improves your immune function and helps reduce inflammation.
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