Foods and Nutrition 1030E Lecture Notes - Lecture 9: Bone, Bone Density, Scleroprotein
20 Oct 2015
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Document Summary
Chapter 9: nutrients involved in bone health and in depth. Contains about 65% minerals, providing the hardness of bone. Contains 35% organic structure for strength, durability, and flexibility. Collagen: fibrous protein in bone tissue- hydroxyapatite (vitamin c) Cortical bone (compact bone) : very dense tissue making up 80% of the skeleton- outer surface of all bones, many of the small bone (wrists, hands, feet) Trabecular bone (spongy bone): scaffolding on the inside of bones, supports cortical bone and makes up 20% of the skeleton- faster turnover rate. Bones are never static, always being turned over. Bone growth- increase in bone size; completed by age 14 in girls and age 17 in boys. Bone modeling- shaping of bone; completed by early adulthood. Bone remodeling- reshaping of bone; occurs throughout life (helps with fractures) Resorption: surface of bones is broken down. Osteoclasts: cells that erode the surface of bones. Formation of new bone by cells called osteoblasts.
