What are organs composed of?

Organs are complex structures comprising groups of tissues that collaborate to fulfill specific functions within the body. Each tissue type plays a distinct role in the operation of the organ. For example, in the stomach, muscular tissue contracts to facilitate digestion, connective tissue provides structural support, and epithelial tissue lines the organ, protecting it and enabling nutrient absorption. This collaborative effort among different tissue types allows organs to perform their unique physiological functions efficiently.

Other answers do not accurately capture the complexity of organs. A single type of tissue does not encompass the multifunctional characteristic of organs, which require various tissues to accomplish different tasks. A mixture of different types of cells is too vague, as it does not indicate the organized structure and functionality provided by multiple tissue types. Cellular organelles are components within cells themselves, rather than structures that interact to form larger organs.