English: Each level of anatomical organization is more complex than the previous level. The first level of anatomical organization is the simplest, while the last level of is the most complex.

1. The most basic level of anatomical organization is the atom. 2. Molecules are made up of atoms. 3. Many different molecules make up a cell. (Shown cell is a cardiac muscle cell) 4. Cells make up tissue. (Shown cell is cardiac muscle) 5. Tissues make up organs. (Shown organ is a heart) 6. Organs working together make up an organ system. (Shown organ system is a circulatory system)

7.Organ systems make up an individual. (Shown organism is a domestic cat)