1. Chapter 2
Cells and cell systems

2. Section 2.1 – Cells and Cell Systems
Tissue – a group of cells with similar shape and function (job) Organ – made of different tissues that have a related function (job) Organ system – groups of organs that have related functions

3. Section 2.1 – Cells and Cell Systems
There are 4 levels of organization:

4. Section 2.1 – Cells and Cell Systems
There are 4 different types of tissues
Muscle tissue

5. Section 2.1 – Cells and Cell Systems
2. Nerve tissue – transfers signals throughout the body so that organisms can respond to changes in the environment

6. Section 2.1 – Cells and Cell Systems
3. Connective tissue – holds together and supports other tissues. It can also connect, protect, and insulate organs

7. Section 2.1 – Cells and Cell Systems
4. Epithelial tissue – covers the surface of organs and the body. Also forms the lining inside our body.

8. Section 3.1 – The respiratory system
The respiratory system brings oxygen into our body when we inhale, for our cells to use It removes carbon dioxide from our body when we exhale

9. Section 3.1 – The respiratory system
As we inhale through our nose, tiny hairs called cilia, and mucus warms the air. Cilia and mucus both trap dirt and other unwanted particles

10. Section 3.1 – The respiratory system
The air continues past our epiglottis and down our trachea At the bronchi, the path splits to our left and right lungs

11. Section 3.1 – The respiratory system
Inside each of our lungs are the bronchioles At the end, past the bronchiole is the alveoli.

12. Section 3.1 – The respiratory system
Alveoli are tiny, thin-walled, sac- like structures surrounded by many blood vessels called capillaries

13. Section 3.1 – The respiratory system
At the alveoli, gas exchange takes place Oxygen will diffuse from the alveolus into the capillaries (blood vessels) Carbon dioxide will diffuse from the capillaries into the alveolus

14. Section 3.1 – The respiratory system
When we exhale, the carbon dioxide is removed from our body

15. Section 3.2 – The circulatory system
The circulatory system circulates blood to all parts of your body. Blood is responsible for delivering oxygen and nutrients and also to remove carbon dioxide and waste

16. Section 3.2 – The circulatory system
There are 4 types of blood vessels Arteries – these carry oxygen rich blood away from the heart Arteries are thick and strong. It can withstand the pressure created by your beating heart

17. Section 3.2 – The circulatory system
Capillaries – are thin and tiny and form a network near tissues. Oxygen and nutrients diffuse through the capillaries into nearby tissues Carbon dioxide and wastes diffuse from the tissues into the capillaries and are taken away

18. Section 3.2 – The circulatory system
Venules and veins – carry deoxygenated blood back to the heart. Deoxygentated blood contains very little oxygen, but very high levels of carbon dioxide Oxygen makes blood red, Carbon dioxide makes blood blue

19. Section 3.2 – The circulatory system

20. The Circulatory system and Respiratory system work together to allow gas exchange in our cells