HUMNNTR 2210 Lecture Notes - Lecture 8: Bone Density, Lactose Intolerance, Parathyroid Gland
4 Aug 2018
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Document Summary
Only nutrient that is also a hormone. Produced in the skin upon exposure to uv light. Many factors can affect ability to absorb uvb rays. Skin pigmentation, latitude, time of day, season, weather conditions, surface area exposed. Is it essential? goal: helps us absorb calcium. Maintains normal range of calcium and phosphorus in the blood. Ensures appropriate amount of calcium is available to all cells. Immune system, brain and nervous system, parathyroid gland, pancreas, skin, muscles, reproductive organs. Cholecalciferol: form synthesized in the human body. Sunlight is the best source of vitamin d. 400 iu per day for infants and children. Some population groups have dif culty meeting the rda. Can cause high calcium levels in the blood in increase. Can lead to calcium deposits in the kidney and other organs. Found in adipose tissue and cell membrane. Vitamin e donates electron to free radicals. Smokers: smoking destroys vitamin e in lungs. Very low fat diets or fat malabsorption issues.
