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Hillcrest School Council Newsletter

E in height -has hyaline cartilage in middle with a metaphysis (transitional zone) at each end where cartilage is being replaced by bone -interstitial growth: cartilage growth by the multiplication of chondrocytes and deposition of new matrix in the interior -responsible for bone elongation -conversion of bone into cartilage: 1) zone of reserve cartilage: farthest from marrow cavity, shows no sign of becoming bone 2) zone of cell proliferation: chondrocytes multiply and arrange into longitudinal columns of flattened lacunae 3) zone of cell hypertrophy: chondrocytes cease to divide and begin to enlarge, walls of matrix between lacunae become very thin 4) zone of calcification: minerals are deposited in the matrix between the columns of lacunae and calcify the cartilage 5) zone of bone deposition: walls between lacunae break down and chondrocytes die, blood vessels and marrow fill the cavity, osteocytes lay down concentric lamellae -bone widening -appositional growth: the deposition of new tissue at the surface -bone is limited to this type of growth -osteoblasts in inner periosteum deposit and calcify osteoid tissue and become trapped in it as osteocytes -produces circumferential lamellae at surface of bone, increasing diameter -bone remodeling: continuous process of absorption of old bone and deposition of new bone -replaces about 10% of skeletal tissue each year -repairs microfractures, releases minerals into the blood, and reshapes bones in response to use and disuse -wolff’s law of bone: architecture of bone is determined by the mechanical stresses placed upon it, and the bone thereby adapts to withstand those stresses -form of a bone is shaped by its functional experience -trabeculae of spongy bone develop along the lines of stress placed on bones -long bones of limbs are thickest at mid-shaft because that is where they are subject to the most stress -collaborative action of bone resorption by osteoclasts and bone formation by osteoblasts -mineral deposition: crystallization process where calcium, phosphate, and other minerals are taken from blood plasma and are deposited in bone tissue -deposited mainly as hydroxyapatite -ectopic ossification: abnormal calcification of tissues -arteriosclerosis -calculus: calcified mass in an otherwise soft organ tetany (muscles can’t relax) -hypercalcemia: blood calcium excess -depression of nervous system. where to buy viagra in lahore where to buy viagra in lahore buy viagra no prescription online -mineral reabsorption: process of dissolving bone which releases minerals into the blood and makes them available for other uses -carried out by osteoclasts -secrete acid phosphate which digests the collagen of the bone matrix -calcium homeostasis: -the body contains 1. 20mg generic viagra viagra sale canada generic viagra rx 85%-90% in the bones -blood concentration: 3. can you buy viagra over the counter in new york cheap viagra online viagra daily long term side effects 100 g of calcium. Less side effects viagra or viagra discount viagra pills buy cheap viagra canada Liver. generic viagra made in india generic viagra au canada Muscle weakness. where to buy viagra in lahore safest online pharmacy viagra A. How much does viagra cost in dubai buy viagra online no rx generic viagra prices howtosmudge.com/pjn-buy-viagra-from-usa-ez/  


 

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