The skin also helps to synthesize vitamin D. Vitamin D (aka cholecalciferol) is synthesized when a precursor molecule absorbs ultraviolet radiation. This molecule then travels to the liver and kidney where it is converted to the active form of vitamin D. Vitamin D is an important substance in the body. It functions to help the body absorb calcium. It also works to help in calcium transport in the intestines.
Day 1 → learn Day 2 → quick review Day 4 → test yourself Day 7 → review again Draw mind maps, flow charts, or color-coded notes. For example, when studying the endocrine system, draw glands with arrows showing hormone flow. The brain remembers images better than plain text. Teach Someone Else Teaching or explaining a topic out loud forces you to organize your thoughts clearly. If you can explain it simply, you really understand it.
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