NUTR 1010 Lecture Notes - Lecture 25: Muscle Contraction, Hydroxylapatite, Spinach
14 Mar 2016
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Trace elements - you need less than 100 mg/d. Calcium, magnesium, phosphorus and luoride are needed for the structure of bone. Iodine is used to make thyroid hormones - metabolic rate. A major mineral - we need > 100mg. It makes up 2% of our body weight. Only about 25% of the calcium in foods is absorbed. Less if you have a diet low in vitamin d. Pregnant women need much more calcium and so the body adapts to absorb more. Your intesine only absorb about 1 cup of milk"s worth at one ime. Oxylates (spinach), phytates (whole grains) and tannins )tea) decrease absorpion. Avoid taking zinc, iron or magnesium supplements when you"re eaing a source of calcium. 1% calcium is in the blood as an electrolyte: In muscle contracion the nerves tell the muscle to contract and the calcium moves into the muscles. Your body will take what it needs from your bones.
