What is a structure composed of two or more tissue types that perform specific body functions called?

The structure that is composed of two or more tissue types working together to perform specific functions in the body is referred to as an organ. Organs serve distinct roles and are vital for the overall functioning of the body. For instance, the heart, which is made up of cardiac muscle tissue, connective tissue, and nervous tissue, plays a key role in circulating blood throughout the body.

In contrast, tissue is a group of similar cells that carry out the same function, such as epithelial tissue or muscle tissue, but it does not combine multiple tissue types to perform broader functions. A system is a complex structure that consists of multiple organs working together to perform a larger purpose, such as the circulatory system or digestive system. A cell is the basic unit of life and is much smaller than an organ, encompassing various organelles that perform cellular functions. Understanding this hierarchy from cells to tissues, organs, and systems is fundamental in the study of human anatomy and physiology.