BIO 3303 Lecture Notes - Lecture 14: Myosin Head, Dynein, Myosin
30 Aug 2016
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All eukaryotic cells show intracellular movement e. g. intracellular trafficking, movement of pigment granules (melanophores) Things are moving around in a very organized way. It does it by using very specific molecules. The frog use this by using microtubules, all pigments are being moved to be concentrated on the inside. Animals are the only groups of multicellular organisms that are able to move between locations: muscle cell (myocyte) found only in animals. All types of movements involve the cytoskeleton and its motor proteins. Diverse muscle types - differentiated by specific arrangements of cytoskeletal elements and motor proteins. Simplest multicellular animals lack true muscles but have contractile cells e. g. porifera (sponges) Cnidarians (e. g. hydra: first muscle-like (myoepithelial) cells. True muscle first appeared in ctenophores (e. g. sea walnuts and sea gooseberries: smooth muscle cells in body wall. Had the basic machinery- sponges contract and open movements on their bodies.
