Download Levels of Organization in Living Things How living things are organized

Levels of
Organization in Living
Things
How living things are organized
Vocab Refresher
Function
What
something is
used for
Something’s
job
Purpose, role
Structure
The way
something is
constructed or
made
The way the
parts of
something are
arranged
ALL organisms perform
the functions of life
Reproduce
Grow and develop
Obtain and use ENERGY
Response to their environment
(stimuli) to maintain balance
(homeostasis)
Adapt to their environment over
time (as a species, not individual)
Unicellular Organisms
Some organisms are made of
only one cell
The cell performs ALL of the
functions necessary for life
Uni- = one or single
Examples: Bacteria, protists,
yeast
Multicellular Organisms
 Have various levels of
organization within
them
 Individual cells may
perform specific
functions (different
types of cells)
 Cells work together for
the good of the entire
organism
 Cells depend on one
another
Levels of organization
Cells
Tissues
Organs
Organ systems
Organism
CELLS
Basic unit of structure
and function in living
things (CELL THEORY!)
Serve specific functions
(different types for
different jobs!)
Examples: blood cells
(erythrocytes), nerve
cells (neurons), bone
cells (osteocytes)
TISSUES
 Made up of cells that
are similar in structure
and function
 The cells work together
to perform a specific
activity
 Examples: blood,
nervous, bone
 4 basic types in
humans:
 connective (blood, fat,
ligaments, cartilage,
bones, tendons),
 epithelial (skin),
 muscle (smooth,
skeletal, cardiac)
 nerve
ORGANS
Made up of tissues that
work together to perform a
specific activity
Examples: heart, brain, skin
ORGAN SYSTEMS
Groups of
organs working
together to
perform specific
functions for the
organism
Examples:
circulatory,
muscular,
digestive
ORGANISMS
 Entire living things carrying
out all life’s functions
 Multicellular organisms
made up of organ systems
 Examples: mushroom,
sunflower, human, fish
 Unicellular – only made up
of a cell (Ex. Bacteria,
protist)
Levels of Organization
Basic
Unit
of
Life
Organisms
Organs
Tissues
Cells
Organ
Systems