Cells combine in terms of function and type to form what?

Cells that have similar structures and functions group together to form tissues. This is a fundamental concept in biology that illustrates the organization of life. Tissues are composed of cells that work together to perform a specific function. For example, muscle tissue is made up of muscle cells that contract to facilitate movement, while epithelial tissue is composed of cells that form protective layers on surfaces.

In contrast, organs are made up of different types of tissues that work together to perform complex functions, such as the heart or lungs. Organ systems consist of multiple organs that collaborate to carry out broader physiological roles in the body, like the circulatory system or respiratory system. Organelles are specialized structures within a cell that carry out specific functions, such as mitochondria for energy production or ribosomes for protein synthesis. Therefore, while these other levels of organization are critical, they are not formed directly from a combination of similar cells.