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Levels of Organization

Definitions of each of the levels of organization in the human body are a click away...

-Level 1 - The Cell 
A cell is the smallest functional and structural unit of all living organisms

-Level 2 – Tissues
It is created by joining cells that have similar function or structure. 

-Level 3 – Organs
An organ is a group of tissues that perform a specific function or group of functions 

-Level 4 - Systems
An organ system is a collection of organs that perform a specific function, like the circulatory system or digestive system. 

-Level 5 – Organism
An organism is a being that's able to perform simple acts of survival. We humans are one.

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