By
Carla Bridges
Why can’t you use your arm muscles to digest food?
You
Are!!!!!!!!!!
An organism made of many cells.
Made by making more small cells,
not by making cells larger.
For
example: Elephant vs. human
 Larger
1.
2.
3.
Size
Larger than single celled
organisms
Prey for less predators
Wider variety of prey
 Longer Life
1. Is not limited to the lifespan of
a single cell
 Specialization
1. Each cell has a specific job.
2. Makes organism more
efficient
 Tissue-group
of cells that work together to
perform a specific job.
 Material around and between the cells is also
part of the tissue.
Animals
1.
2.
3.
4.
have four types of tissue
Nerve tissue
Muscle tissue
Connective tissue
Protective tissue
Plants have three types
of tissue:
1. Transport tissuemoves water and
nutrients through a
plant
2. Protective tissuecovers the plant;
helps the plant retain
water, protection
3. Ground tissuephotosynthesis takes
place here

 Organ
- a structure
made up of two or
more tissues
working together to
perform a specific
function
Has several kinds of tissue.
 Muscle
tissue makes food move in and
through the stomach.
 Special tissues make chemicals that help
digest your food.
 Connective tissue holds the stomach
together.
 Nervous tissue carries messages back
and forth between the stomach and the
brain.
Larger
Size
Longer Life
Cell Specialization
Organ
- a structure made up of
two or more tissues working
together to perform a specific
function
A
group of organs working
together to perform a particular
function is called an organ
system.
Each
organ system has a
specific job to do in the body.
Plants have organ systems also:
Leaf
system
Stem system
Root system
Digestive system
Stomach and Intestines
1. Job is to break down food into small particles.
2. The rest of the body depends on the digestive
system for fuel.
 The digestive system depends on the respiratory
and cardiovascular systems for oxygen.

Cardiovascular System


Heart and Blood Vessels
Carries fuel to the rest of the body
 Anything
that can perform life processes by itself
is an organism.
2
types
 Unicellular
and multicellular
Unicellular organisms
 Bacteria
 Protists
 Some Fungi
 Live in colonies but all of the cells are
single cells
 Each cell must carry out all life
processes to survive
In Contrast:
Even the simplest
multicellular organism has
specialized cells that
depend on each other for
the survival of the organism.
Cell
Tissue
Organ
Organ
system
Organism
Structure is the arrangement of parts in an
organism.
 Includes
the shape of a part and the material
of which the part is made.
 Example:
 The structure of the lungs is a large spongy
sac.
Function is the job the part does
 Example:

The function of the lungs is to carry oxygen to
the rest of the body.
 Connection;
 The
structure of the lungs enables them to
perform a function.
Break
into pairs
according to shoe
color
Holt Science and Technology. Holt, Rinehart, and
Winston. Harcourt Education Company. Austin,
Texas 2005.
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UCP 1: Systems, order, and organization
UCP 2: Evidence, models, and explanation
UCP 5: Form and function
LS 1a: Living systems at all levels of organization demonstrate
the complementary nature of structure and function. Important
levels of organization for structure and function include cells,
organs, tissues, organ systems, whole organisms, and
ecosystems.
LS 1b: All organisms are composed of cells—the fundamental
unit of life. Most organisms are single cells; other organisms,
including humans, are multicellular.
LS 1d: Specialized cells perform specialized functions in
multicellular organisms. Groups of specialized cells cooperate
to form a tissue, such as a muscle. Different tissues are in turn
grouped together to form larger functional units, called organs.
Each type of cell, tissue, or organ has a distinct structure and
set of functions that serves the organism as a whole.