NUTR 1010 Lecture Notes - Bone Resorption, Vitamin D Deficiency, Soy Milk
14 Apr 2013
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Document Summary
Bones are dynamic, living organs; they have many important roles in the body and it is important to maintain them. Structural support for organs and body segments: bone tissue acts as a storage reservoir for many minerals including calcium, phosphorus and fluoride; the body draws on these, bones protect our vital organs ex. the rib. Production of blood cells in bone marrow cage protects our lungs. Muscle support for movement; muscles attach to bones via tendons. Minerals 65%; provides hardness; mostly calcium and phosphorus. Organic substances 35%; provides strength, durability and flexibility; collagen (a fibrous protein) Major roles: calcium, vitamin d, vitamin k minor roles: magnesium, phosphorus, vitamin a, protein, fluoride. Growth: determines bone size; begins in womb and continues until early adulthood. Modelling: determines bone shape; longitudinal growth, continues into early adulthood. Peak bone mass: highest amount attained during the years of normal bone growth; ends during adolescence or late 20"s; influenced by nutrition, exercise, disease, drugs.
