1. Lesson: Respiration

2. Respiration
- The release of energy from food.
ENERGY
Aerobic respiration requires oxygen.

3. Our digestive system breaks down food so it can be transported in the blood to all our cells.

4. Our respiratory system supplies our cells with oxygen for respiration.
This helps us to get
energy from food.

5. What are the products of aerobic respiration?
food +
oxygen =
ENERGY
+ water vapour
+ carbon dioxide

6. How could we show the products of aerobic respiration?
Water vapour
Woodlice + cobalt chloride paper
Carbon dioxide
Woodlice + limewater
Energy
Peas and a thermometer
Can you think of other ways to show these products?

7. Equation for aerobic respiration
food +
oxygen
energy +
carbon dioxide +
water vapour

8. Now, write down the equation for aerobic respiration.
carbon dioxide
Now, write down the equation for aerobic respiration.
energy
food
oxygen
water vapour

9. We use our lungs to take oxygen into our bloodstream for respiration.
windpipe
lung

10. We also use our lungs to excrete carbon dioxide.
windpipe
Use the diagram of the lungs in your textbook to locate these structures.
lung
bronchus
bronchiole
air sac
diaphragm

11. Gas exchange occurs in tiny air sacs.
Carbon dioxide
Oxygen
(from air)
(into air)
air sacs
When we breathe in, oxygen moves from air sacs into our bloodstream.
Carbon dioxide moves from our bloodstream into air sacs and is excreted out when we breathe out.

12. Smoking damages our lungs and slows down gas exchange.
Smoking causes:
Bronchitis
Lung cancer
Heart strain

13. So say NO to cigarettes!

14. Review Question.
Label each part. A B C D

15. Question to think about.
Is it a good idea
to smoke during pregnancy?