What is the main difference between a tissue and an organ?

The main difference between a tissue and an organ lies in their composition and structure. A tissue is defined as a group of similar cells that work together to perform a specific function. For example, muscle tissue is made up of muscle cells that contract to enable movement.

On the other hand, an organ consists of two or more types of tissues that collaborate to perform more complex functions. Each type of tissue within an organ contributes to the organ’s overall purpose. For instance, the heart is an organ that contains muscle tissue, connective tissue, and nerve tissue, all working together to pump blood throughout the body.

This distinction highlights how tissues serve as building blocks for organs, allowing for more intricate functions that are essential for the body’s overall operation. Understanding this relationship is crucial in biology as it illustrates the organization of living organisms from simple to complex structures.