classnotes13 - Movement and locomotion: Background: Two...

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Movement and locomotion: Background: Two parts are needed: - skeleton - provide support, protection, and movement. - exoskeleton/endoskeleton - also, hydrostatic skeleton - muscles - muscles move the skeleton, and therefore the animal. - bones are moved against each other by using joints. See fig. 30.3C on p. 607 for some examples. - muscles only contract, so they are usually arranged in opposing groups. - [Fig. 30.7, p. 611] Muscle function (skeletal) [Fig. 30.8, p. 612] : - muscles are composed of bundles of muscle fibers. - these bundles are in turn composed of individual muscle fibers, which are actually individual muscle cells. - in turn, these are composed of: - myofibrils. And yet again, Myofibrils in turn are composed of two types of molecules: - actin - makes up thin filaments - myosin - makes up thick filaments - actin and myosin are arranged in a very regular pattern that allows these filaments to slide past each other as the muscle contracts. - each unit of actin/myosin is called an sarcomere.
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classnotes13 - Movement and locomotion: Background: Two...

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