NEET Biology Chapter 7

Structural Organisation In Animals

In the Preceding Chapters you came across a large variety of organisms, both unicellular and multicellular, of the animal kingdom. In unicellular organisms, all functions like digestion, respiration and reproduction are performed by a single cell. In the complex body of multicellular animals the same basic functions are carried out by different groups of cells in a well organised manner. The body of a simple organism like hydra is made of different types of cell and the number of cells in each type can be in thousands. The human body is composed of billions of cells to perform various functions. How do these cells in the body work together? In multicellular animals, a group of similar cells along with intercellular substances perform a specific function. Such an organisation is called tissue

These tissues are arganised in specific proportion and pattern to form an organ like stomach, lung, heart, and kidney. when two or more organs perform a common function by their physical and/or chemical interaction. They together from organ system, eg; digestive system, respiratory system, etc....Cells, tissue, organs and organ system split up the work in a way that exhibits of labour and contribute to the survival of the body as a whole

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