1. Levels of Organization

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.
There are many different types of cells.
Their shape and structure depend on their function.

4. Some examples of cells are…
Nerve Cells – need to have “arms” to reach out to other cells to conduct electric signals.

5. Bone Cells need to be very dense, and have lots of calcium and other minerals inside.

6. Muscle Cells have to be long and skinny so that they can contract together and make things move.

7. Red Blood Cells have to be tiny to fit through capillaries .
White Blood Cells have to be able to “stick” to germs to destroy them.

8. Make a “bullseye” diagram on your page.
Label the center circle as “cells” because all living things are made of cells.
Cells = basic unit of living things

9. Two or more kinds of cells that work together to do a job are called a tissue.

10. Some examples of tissues are…
Nervous tissue = nerve cells + connective cells

11. Blood tissue = red blood cells +
white blood cells +
platelets

12. Adipose Tissue = lipid cells + connective cells

13. Esophageal tissue = mucous cells +
muscle cells +
connective cells

14. Now add another layer to your bullseye
Cells = basic unit of living things
Tissue = two or more cell types
working together

15. Two or more kinds of tissues that work together to do the same job are called an organ.

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

17. Kidneys
nephron tissue + tubule tissue + connective tissue + muscle tissue

18. Bones
Osteoblast tissue + Bone marrow + Blood tissue + Nervous tissue + Connective tissue

19. Skin
epidermal tissue + dermal tissue + sweat glands + muscle tissue + adipose tissue Fun fact: skin is the largest organ in the body

20. Now add another layer to your bullseye
Cells = basic unit of living things
Tissue = two or more cell types
working together
Organ = two or more tissue types
working together

21. An organ system is a group of organs working together to perform a function.

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

23. Respiratory System
nose
trachea
bronchioles
alveoli
diaphragm (muscle)

24. Integumentary System
skin
mucous membranes
hair
toenails
fingernails
eyelashes

25. Circulatory System
heart
arteries
veins
capillaries
blood

26. Now add another layer to your bullseye
Cells = basic unit of living things
Tissue = two or more cell types
working together
Organ = two or more tissue types
working together
Organ System = two or more organs
working together

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

28. 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).

29. Now add another layer to your bullseye
Cells = basic unit of living things
Tissue = two or more cell types
working together
Organ = two or more tissue types
working together
Organ System = two or more organs
working together
Organism = living thing that can exist by itself

30. The needs of each individual cell are met by systems working together
The needs of each individual cell are met by systems working together. (write this in your notes)
For example, these smooth muscle cells found in the stomach wall…
Get the oxygen they need from
the respiratory system which absorbs the oxygen in the lungs
and
the circulatory system which delivers the oxygen in the blood to each cell

31. The needs of each individual cell are met by systems working together.
Get the food they need from
the digestive system which breaks food into chemicals
and
the circulatory system which delivers the chemicals in the blood to each cell
For example, these smooth muscle cells found in the stomach wall…

32. The needs of each individual cell are met by systems working together.
Know when to contract and churn because
the nervous system sends signals from the brain, along nerves
and
the muscular system receives the signal and sends calcium to the stomach cells
For example, these smooth muscle cells found in the stomach wall…

33. The needs of each individual cell are met by systems working together.
Know when to divide and grow when
the endocrine system releases hormones from the pituitary
and
the circulatory system delivers those hormones to the cell
For example, these smooth muscle cells found in the stomach wall…