BIOL 207 Lecture Notes - Lecture 3: Parathyroid Gland, Osteoclast, Coagulation
Document Summary
The thickness of bone depends on two processes: deposition , occurs whenever bones are increasing in size, of calcium ions from bone to blood. **osteoblasts are active in this process*: reabsorption , always means: returning something to the blood/ blood stream/ circulatory system/ capillaries. ** bone a storage place for calcium*: levels off calcium in blood needs to be maintained, bone stores calcium. If there"s a need: demineralization, can be released through urine, but can also be stored in blood vessels, part of blood plaque. Functions of calcium: transmission of impulses along nerve fibers, release of nts (neurotransmitter) at the synaptic ending, coagulation of blood, glandular secretion, cell division, mitosis, meiosis, enzymatic cofactors, enzyme activators, bone structure, 99% calcium is stored in bone. Gravity: bones get bigger as one becomes a couch potato and gains a lot of weight. Functional forces: (pg189: wolff"s law, bone grows or remodels in response to the demand placed on .
