2. BENEFITS OF BEING MULTICELLULAR
• Larger Size: larger organisms are prey for
fewer predators. Also, large predators can
eat a wider variety of prey
• Longer Life: not limited to the life span of
any single cell
• Specialization: each type of cell has a
particular job. This makes the organism more
efficient!
4. • Level 1: Cell
• -smallest unit that
can perform life
processes
independently
• -vary in size and
shape
• -Example: plant
cell (square) and
animal cell
(round)
5. LEVEL 2: TISSUE
CELLS WORKING TOGETHER
• Tissue: a group of cells that work together
to perform a specific job
Animals have 4 basic types of tissues:
1. nerve tissue
7. 4. Protective
Tissue
Example:
Adipose (fat)
cells in the
skin
8. PLANT TISSUES
• Plants have 3 types
of tissue:
1. transport
tissue
2. protective
tissue (dermal)
3. ground tissue
9. LEVEL 3: ORGAN
TISSUES WORKING TOGETHER
• Organ = a collection of tissues that
carry out a specialized function of the
body
• Example: heart
- has mostly cardiac tissue, but also
has nerve tissue and tissues of the
blood vessels that all work together
• Other examples: stomach, intestines,
brain, and lungs
10. • Examples in plants: the
leaf plant organ that
contains tissue that
traps light energy to
make food
• Also: stems and roots
11. IS THAT A FACT?!
In your lifetime, your body will shed
about 40 pounds of dead skin!
12. LEVEL 4: ORGAN SYSTEM
ORGANS WORKING TOGETHER
• Organ system =
group of organs
that work together
to perform body
functions
• Examples: digestive
system, which
includes several
organs, such as the
stomach and
intestines
13. ON ITS OWN: ORGANISM
• Organism = a living thing; anything
that can carry out life processes
independently
• An organism can be unicellular, like
this bacteria:
14. • OR an organism can be
multicellular, like you!
15. STRUCTURE & FUNCTION
• In organisms, structure and function are
related.
Structure = arrangement of parts in an
organization
-Includes the shape of a part and the
material of which the part is made
Function = the job that the part does
16. EXAMPLE OF STRUCTURE AND
FUNCTION:
The structure of the
lungs is a large,
spongy sac. Blood
vessels wrap around
aveoli (air sacs). The
structure of the
aveoli and blood
vessels enable them
to perform a
function, which is
bring oxygen into
the body and take
out carbon dioxide.
17. REVIEW:
1. A ____________ is the most basic unit of all living
things.
2. The job that an organ does is the _________ of that
organ.
3. A group of cells working together to perform a
specific function is a ______.
