The cell theory is one of the fundamental concepts in biology that explains the basic structure, function, and organization of living organisms. It is a scientific theory that describes the properties of cells and their role in the structure and function of living organisms.

The cell theory consists of three main parts that define the basic properties of a cell. These three main parts are as follows:

Part 1: All living things are made up of cells

This part of the cell theory states that all living things, whether they are plants, animals, or microorganisms, are made up of one or more cells. Cells are the basic unit of life and serve as the building blocks for all living organisms.

Part 2: Cells are the basic unit of life

This part of the cell theory states that cells are the smallest unit capable of carrying out all life processes. They are self-contained and have all the necessary components to carry out essential functions such as metabolism, reproduction, and response to stimuli.

Part 3: All cells come from pre-existing cells

This part of the cell theory states that all cells arise from pre-existing cells through a process called cell division. This means that new cells are formed by dividing existing cells into two or more daughter cells.

Overall, these three parts of the cell theory provide a framework for understanding how living organisms function at a cellular level. They also help scientists to understand how diseases develop and how they can be treated by Targeting specific cellular processes.


In conclusion, understanding these three main parts of the cell theory is crucial for anyone studying biology or interested in learning about how living organisms work. By understanding these fundamental principles, we can gain insights into how our bodies function at a cellular level and develop new treatments for diseases based on this knowledge.