What do we call a group of tissues that work together to perform a specific function?

A group of tissues that work together to perform a specific function is referred to as an organ. Organs are composed of multiple types of tissues that collaborate to fulfill particular biological tasks. For example, the heart is an organ made up of muscle tissue, connective tissue, and nerve tissue, all of which work together to pump blood throughout the body.

Understanding the distinction between organs, tissues, and other biological structures is crucial in fields such as esthetics, where knowledge of the body's makeup contributes to the effective treatment of skin and overall health. Tissues, on their own, are groups of similar cells working together, while systems are collections of organs that collaborate to carry out complex functions (like the circulatory system). Cells represent the smallest unit of life and do not function independently to perform the roles characteristic of organs.