1. The Respiratory System
California Science Standard Covered in this Lesson:
LIFE SCIENCE 2b. Students know how blood circulates through the heart chambers, lungs, and body and how carbon dioxide (CO2) and oxygen (O2) are exchanged in the lungs and tissues.

2. The purpose of the respiratory system is to move oxygen & carbon dioxide between the air & your blood, in order to meet the needs of each of your body cells.

3. The main body organs or parts of the respiratory system are:
Nose (mouth sometimes)
trachea (windpipe)
bronchi tubes
lungs (main organ)
bronchioles (smaller tubes)
alveoli (tiny air sacs)
diaphragm

4. How is air brought into your lungs?
The diaphragm, a muscle just below your lungs & near the bottom of the ribcage, helps pull in air into the body (as well as force it out).
This is how it does it 

5. Breathing is the process by which you inhale and exhale.
When you inhale oxygen (O2) enters in.
When you exhale your body gets rid of carbon dioxide (CO2).

6. All living things need oxygen in order to release the energy (from food) that cells need.
Without oxygen the energy found in nutrients can’t be converted into a useful form of energy that the cells can use.

7. My lungs are working extra hard! Can we slow down?.
When the body needs more oxygen, it will breathe rapidly to get the oxygen it needs to meet its energy needs.
As the body gets more active, it needs more oxygen.
My lungs are working extra hard! Can we slow down?.

8. Learn the song “Respirate”
What path does oxygen take when you inhale?
Learn the song “Respirate”
Oxygen from the air enters through the nose and mouth Goes down along the trachea, also called the windpipe Then divides into two bronchial tubes Which soon enter the pair of your lungs Those bronchial tubes branch off into smaller and smaller parts Taking oxygen to tiny sacs called the alveoli Where it is exchanged with carbon dioxide in the blood of the capillaries. The oxygen-rich blood travels through pulmonary veins Taking it back to the left chambers of the heart Which pump it all throughout arteries that take it Toward every cell in the body
Oxygen v
Nose or mouth
Trachea
Bronchial Tubes
Lungs
Bronchioles
(smaller tubes)
Alveoli
Transfers into
Capillaries
& begins its
travels through the
circulatory system

9. “Respirate” A Respiratory System Song - by. Mr. Rojas

10. Q: How far does the respiratory system carry the oxygen you breathe in?
It carries the oxygen as far as the tiny sacs in your lungs called the alveoli.

11. In the lungs, the exchange of gases (oxygen & carbon dioxide) occurs in tiny air sacs called the alveoli.

12. Q: What two things happen at the same time in the alveoli (air sacs)?
Blood picks up oxygen from the lungs at the alveoli and blood releases carbon dioxide into the alveoli.

13. How does oxygen move to the circulatory system from the alveoli?
Capillaries wrap around each air sac. The air sacs have thin walls that let gases move through them.

14. Your body is so complex that it takes two systems working together as a team to get oxygen to your body cells.

15. How does the respiratory system work with the circulatory system?
The respiratory & circulatory systems work together to get oxygen to cells (and to help them get rid of carbon dioxide).
The respiratory system brings oxygen into the lungs and gets it into the blood.
The circulatory system takes that oxygen and transports it through the blood to your body cells.
Also, carbon dioxide is removed from your cells by the circulatory system and brought to your lungs, which exhale it back out of your body and into the air outside.

16. Test what you know with an online practice quiz on the Respiratory System: