The 'Structural Organization in Animals' chapter discusses unicellular and multicellular organisms of the animal kingdom. The chapter talks about all the functions, such as respiration, digestion, and reproduction in unicellular organisms that are performed only by a single cell. Different groups of cells perform all the above basic functions inside the complex body of multicellular animals in an orderly manner.
All those animals who have complex body structures are made up of four basic types of tissues. These four tissues are placed in specific locations inside the body to develop organs, like the stomach, heart, kidney, and lungs. The topics of this chapter have been explained below.
This chapter concentrates on the specific set of functions that in multicellular organisms are performed by similar cells. Hence, this group of similar cells that carries out a particular function is called a tissue. In animals, tissues can be segregated into four different types: Connective, Epithelial, Nural, and Muscular. The arrangement of these complex animal tissues in a particular pattern and proportion helps in the formation of an organ in them.
When formed, these organs provide functionality through their chemical and physical interaction that comprises the organ system. Tissues, cells, organs, and organ systems in animals divide their operation in such a manner that clear division of labour and their contribution towards the survival of the body is visible. All these different animal bodies are very nicely portrayed in the chapter using animals, such as frogs, earthworms, and cockroaches, as examples.
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