BISC208 Lecture Notes - Lecture 5: Hemolymph, Body Cavity, Gas Exchange
16 May 2016
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Document Summary
Comparative studies shows how form an function are closely related. Homologous: similar in origin different in function recent common ancestor may appear in embryonic development and disappear before birth. Analogous: different in origin, similar in function , lacks recent common ancestor. Vestigial: structures that serve of no use to the organisms (dew claws in dogs) Physiology: chemical and physical processes necessary for survival. Circulatory system: transport nutrients and gasses through the body, simple diffusion allows some water, nutrient, waste, and gas exchange into primitive animals that are only a few cell layers thick. Closed circulatory systems: can have single or double circulatory circuits; in double circulatory systems, one system is involved in gas exchange, while the other distributes oxygen and nutrients throughout the body. Transport necessary materials to all the cells of an animals body. Transport waste products away form the cells where they can be realeased into the environment. Body cavity with a single opening to the outside.
