Levels of Organization
Flash Cards
Directions
 Draw
the picture on the front of
the flashcard for each level of
organization.
 The second slide has the notes you
will write on the back of the
flashcard.
 Make sure you use bullets and that
you write the notes exactly as they
are given.
heart cell
Cell
Cells
• First level of organization.

An individual cell that is
specialized and performs a
specific function.
heart tissue: many heart
cells
Tissue
Tissues
Second

Level
Group of cells that work
together to perform a specific
job.
heart: muscle & nerve
tissue
Organ
Organs

Third Level
Two
or more tissues that
work together to perform a
specific job.
cardiovascular (circulatory)
system: heart & blood vessels
Organ System
Organ Systems
 Fourth
Level
 Group of organs working together
to perform a specific function.
 Organs in the system depend on
each other. Failure of one organ
will cause system to fail.
human organism
Organism
Organisms
 Human
body functions because of the
contributions of all 4 levels of
organization.
 Organ systems depend on each other.
Failure of one system can cause
failure of the organism.
 Ex: Circulatory (cardiovascular)
system and respiratory system work
together to get oxygen to cells.