Tissue Level of
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
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.