Which term describes the collection of tissues that work together to perform a specific function?

The term that describes the collection of tissues working together to perform a specific function is "organ." An organ consists of two or more types of tissues that collaborate to facilitate unique functions within the body. For example, the heart is an organ composed of muscle tissue, connective tissue, and nervous tissue, all contributing to its function of pumping blood throughout the body.

In contrast, a "cell" refers to the smallest unit of life, which is not composed of multiple tissues. "Tissue" is a group of similar cells specialized to perform a particular function, but it does not encompass the broader organization that an organ entails. A "system," on the other hand, refers to a group of organs that work together to perform complex functions within the body, but it is at a higher level of organization than an organ. Thus, "organ" specifically captures the idea of a collection of different tissues that collaborate for a particular operational purpose.