Group of similar cells having a common function

Different types of cells performing the same functions

Different types of cells performing different functions

Organised group of cells performing many functions

A tissue is a group of similar cells that work together to perform a particular function. Examples of tissues are muscle tissue, nervous tissue, etc.

A group of cells of the same origin performing a definite function is called tissue. Thus, a tissue represents a group of cells similar in structure, origin, and function. There are four main tissue types in the human body: epithelial, connective, muscle, and nervous. Each is designed for specific functions.

A group of cells that are of common origin, similar in structure and work together to perform a specific function is called a tissue. Blood, phloem, muscle, etc., are all examples of tissues.

Histology is the branch of biology that studies the anatomy of biological tissues. It is also known as microscopic anatomy. It deals with the study of tissues. It is used to diagnose disease in humans, animals and plants.