What do two or more tissues combine to form?

When two or more types of tissues come together, they form an organ. An organ is a structure composed of multiple tissue types that work together to perform a specific function within the body. For example, the heart, which consists of muscle tissue (to contract and pump blood), connective tissue (to provide structure), and nerve tissue (to regulate heart rate), is a classic example of how diverse tissues collaborate to fulfill a vital role.

In contrast, cells are the basic building blocks of all living organisms and combine to form tissues rather than organs. Tissues are groups of similar cells working together and do not represent a combination of different types of tissues. Systems refer to collections of organs that work together to perform complex functions, composed of multiple organs, not just tissues. Thus, when discussing the relationship between tissue types and their resultant structures, organs are rightly identified as the product of tissue integration.