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Chapter: 11th Zoology : Chapter 3 : Tissue Level of Organisation

Tissue Level of Organisation: Introduction

Groups of cells that are similar in structure and perform common or related functions are called ‘tissues’.

Tissue Level of Organisation

In multicellular organisms, cells do not operate independently, instead, they form tight cell communities that live and work together. Individual body cells are specialized, with each type performing specific functions that helps to maintain homeostasis and benefits the body as a whole. Cell specialization is obvious. How the muscle cell looks and acts differs greatly from skin cells. Cell specialization allows the body to function in co-ordinated ways.

Groups of cells that are similar in structure and perform common or related functions are called ‘tissues’.

Tissues are organized in specific proportions and patterns to form organs like lungs, heart, stomach, kidneys, ovaries, testes etc; hence the tissues are called the ‘living fabrics’. If two or more organs perform common physical and chemical functions they are called ‘organ systems’, Eg: digestive system, respiratory system, circulatory system, excretory system, etc. Most organs contain different types of tissues and their arrangement determines the organ’s structure and functions. The study of tissues, or histology, complements the study of gross anatomy. Together they provide the structural basis for understanding organ physiology.






 

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