BIOL1002 Lecture Notes - Lecture 5: Intestinal Villus, Fish Gill, Flattening

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An organ is a structure consisting of multiple tissues which work together to perform a specialised function. e. g. the small intestine is made up of epithelial, connective, nervous and muscle tissues. In the small intestine, nutrients from food are absorbed from the lumen of the intestine across the epithelial cells which make up the intestinal wall, before entering the bloodstream. An organ system is a group of tissues and organs that work together to perform one or more functions: e. g. the digestive system, the nervous system, the respiratory system. The levels of organisation are not independent of one another: the structure and function of each component are tightly integrated with those of other components. Therefore, an organism is more than the sum of its individual cells, tissues, organs or organ systems. Each system has evolved a collection of adaptations and trade-offs to accomplish a specific task necessary for survival and reproduction, with the help of other systems.

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