Kinesiology 3347A/B Lecture 6: Lecture 6
30 Mar 2016
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Recall the null"s model of constraints: task - environment -individual, what is a key factor for the individual constraint in dunking a basketball, i. e. body fat, athleticism, bone growth etc. Body system factors: the average pattern of change within each system, the range of individual variations for a system. Before birth: ossi cation begins at primary ossi cation centres int he mid portions (diaphysis) of long bones. Blood supply enters at the mid portion of the bone for this reason: starts at fatal age of 2 months, ~800 total ossi cation centres, 400 appear prenatal and 400 postnatal. Postnatal: growth in bone length occurs at secondary centres at the ends of bones. Epiphyseal plates can be seen on an x-ray because they are not made of bone. Epiphyseal plates are made of calci ed cartilage which is why it shows up on an x-ray when it is open.
