The fourth level of cell organization is the
organ level. The organ level is a structure composed of collections of tissues
that perform specific functions in a living organism. Organs that are found in
a human body are the heart, lungs, brain, pancreas, liver, among others. These
organs perform specific functions and work in an interconnected manner for the
human body to function well. When organs work together, they are called organ
systems which are already the fifth level of cell organization.
