The Levels of Organizations

cells:

The cell is the basic unit of structure and function of a living thing.

Cells are specialized by size and shape for the job they do

one or more cells in an organism

Tissue

group of similar cells that work together to do a specific job in the body

Organs

made up of two or more tissues that work together to do a specific job

Example: a heart

Organ System

organ system is a group of organs working together to perform particular jobs

Organisms

Sum of all cells, tissues, organs and organ systems makes an organism. An organisms is made when a group of organ systems work together