BIOL 207 Lecture Notes - Lecture 13: Intramembranous Ossification, Thyroid, Phosphate Minerals
22 Oct 2016
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Materials go back into general circulation from the tubual. Hormones promote deposition (osteoblasts) and reabsorption ( osteoclasts) Need to maintain calcium calcium physiology: transmission of impulses across nerve fibers. Balance of ions at all times: proper release of nerurotransmitters at synaptic endings, contraction of muscles w/o calcium muscle can"t contract properly, coagulation of blood- 3 reactions require calcium: proper glandular secetions, cell division (mitosis, enzymatic cofactors. Can"t do job w/o enzyme: supply bone with calcium. Hormonal control of bone development and maintenance: parathormone and calcitonin. Parathormone- produced by parathyroid (small things on thyroid gland) 99% of calcium in body is in bone. Both hormones maitain blood calcium levels: growth hormone (gh) Liver gh stimulates it to create 2nd growth factor. Chemical that does everything related to growth hormone. Sematopoedin: thyroid hormone- produces 4 versions of thyroxin. Makes sure body grows in normal porportion regulates porpotionality: apuberty- sex hormones kick in testoserone and estrogen.
