1. Starter
Which of these have blood, lungs, kidneys or digestive system?

2. Obtaining and transporting the materials our bodies need / produce
How are organ systems specialised for exchanging substances?
How does surface area influence the exchange of food and oxygen?
How has the use of artificial aids to
breathing developed?

3. How are organ systems specialised for exchanging substances?
Which of these have blood, lungs, kidneys or digestive system?
As organisms get b.…...er or more c……….. , it becomes harder to exchange substances with their surroundings
Stretch; note down four of the main “substances” that need to be exchanged and what process each substance is involved in

4. How are organ systems specialised for exchanging substances?

5. The breathing system
windpipe
Ribs
Rib muscles
Diaphragm
Right Lung
Left Lung
The breathing system takes air into and out of the body so we can obtain oxygen and get rid of waste carbon dioxide

6. trachea
ribcage
diaphragm
Alveoli
Intercostal muscles

7. Make your own model lungs…
This You tube link will show you how

8. Inhalation
(When we breathe in we inhale)

9. Exhalation
(When we breathe out we exhale)

10. How has the use of artificial aids to
breathing developed?
Iron Lung
Draws air into the lung
Modern Ventillator
Pushes air into the lung

11. Air rushes down the t………
Air rushes down the t………., through the airways of the lungs and ends up in the a…….…

12. The Alveoli
The air we inhale makes its way into thousands of tiny “air sacs” (alveoli) in the lungs.
The outside of the alveoli is covered with capillaries (tiny blood vessels).

13. Over time, what will happen to the particles?
How do the lungs help us get oxygen into our blood and carbon dioxide out of our blood?
Area A
Area B
QUESTION
Over time, what will happen to the particles?

14. How are the lungs adapted for gas exchange?
Each alveolus is surrounded by capillaries which pick up the …………. in each lungful of air you breathe in.
The capillaries also bring carbon dioxide (CO2) from ………..cell in the body and let the CO2 out into your lungs so you can breathe it out.

15. Which design would be better for the alveoli to exchange gases with the capillaries of the lungs
Big surface area
Very thin layer of cells
Lots of capillaries

16. How are organ systems specialised for exchanging substances?
Villi line the small intestine.

17.                                               
Food in intestine

18. The blood now carries this oxygen to the cells of the body.
Right Lung
Left Lung
Blood vessel O2
Body cells O2
Blood