2. Anatomy –
◦ The study of the structure
of an organism and its
parts
Ex. Studying the bones in a duck
wing
Physiology –
◦ The study of the structures
function.
What the structure does and how
it does it
Ex. How a chicken wing moves to
3. The human body has 5 levels of
organization.
Cells Smallest
◦ Tissues
Organs
Organ systems
Organism Largest
4. Cells
◦ The basic unit of life
Tissue
◦ A group of cells working
together to perform a specific
function
Ex. Muscle Tissue
Organ
◦ A group of tissues working
together to perform a specific
function
Ex. Liver
5. Organ System
◦ Several organs working
together to perform a
specific function
Ex. Digestive System
Organism
◦ A living thing!
◦ When several organ
systems work together
Ex. A cat
6. If you weren’t sick of these already...
Cells!
What kind of cells make up the
human body?
Prokaryotic or Eukaryotic
What kind of Eukaryotic Cells?
Plant or Animal
But do all our
cells look like this? NO!
7. Specialized Cells
All organisms start out as a single cell
◦ Unicellular organisms stay as a single cell
that performs all of it’s life functions
As the cell divides, the new cells
differentiate and become specialized
cells.
◦ This means they develop a specific shape
and specific function
8. For example
Some cells become red blood cells
which lose their nucleus to have
more space to carry oxygen to
different parts of your body.
9. Some cells become neurons which
are nerve cells. They grow long
extensions to send messages around
your body
10. Some cells become liver cells which
produce special enzymes to break
down toxins
