1. Levels of Organization
Living Things

2. You already know that everything that is alive or was once alive is made of cells (these are cells in the stem of a plant)

3. Cells are the basic unit of living things
Draw this circle on your page IN THE CENTER

4. Some examples of cells are…
Nerve Cells

5. Some examples of cells are…
Bone Cells

6. Some examples of cells are…
Muscle Cells

7. Some examples of cells are…
Blood Cells

8. Two or more kinds of cells that do the same job are called a tissue
Draw this diagram on your page

9. Some examples of tissues are…
Brain tissue = nerve cells + connective cells

10. Some examples of tissues are…
Blood tissue = red blood cells +
white blood cells +
platelets

11. Some examples of tissues are…
Adipose Tissue = lipid cells + connective cells

12. Some examples of tissues are…
Esophagus tissue = mucous cells +
muscle cells +
connective cells

13. Two or more kinds of tissues that do the same job are called an organ
Add another layer to your bullseye diagram

14. Some examples of organs are…
Lungs = alveoli tissue +
bronchial tissue +
connective tissue

15. Some examples of organs are…
Kidneys = nephron tissue +
tubule tissue +
connective tissue +
muscle tissue

16. Some examples of organs are…
Bones = Osteoblast tissue +
Bone marrow +
Calcium +
Connective tissue

17. Some examples of organs are…
Skin = epidermal tissue +
dermal tissue +
sweat glands +
muscle tissue +
adipose tissue
skin is the largest organ in the body

18. Two or more organs that work together on the same job are called an organ system

19. Some examples of organ systems are…
Digestive System
Mouth
Esophagus
Stomach
Liver
Small Intestine
Large Intestine
Anus
organs

20. Some examples of organ systems are…
Respiratory System
nose
trachea
bronchioles
alveoli
diaphragm (muscle)

21. Some examples of organ systems are…
Integumentary System
skin
mucous membranes
hair
toenails / fingernails
eyelashes

22. Some examples of organ systems are…
Circulatory System
heart
arteries
veins
capillaries
blood

23. Many organ systems working together meet the needs of an entire organism.

24. What’s an organism?
An organism is any living that which can exist by itself – without help from other organs or tissues or cells.

25. An organism can be as big as a bear with many systems, or as small as a bacterium, that has only a single cell (and no actual systems.)