1.
Main Idea: Many parts of our bodies must work together. To produce
the energy needed for movement, muscle cells need a constant supply of
oxygen, nutrients, and water.

2. Goal
You will understand how breathing delivers oxygen needed by cells to the blood.

4. The Path of Air:
Nose
Pharynx
Trachea
Bronchi
Lungs

5. Keeping Your Lungs Clean
Hairs inside nose
Goblet cells in nose and airways release sticky mucus that helps trap particles & keeps air moist.
Cilia covers inside of airways

6. Pharynx
After flowing through the nasal cavities, air enters the pharynx, or throat. The pharynx is the only part of the respiratory system that is shared with another system—the digestive system.

8. Bronchi
Air moves from the trachea to the bronchi, the passages that direct air into the lungs. The lungs are the main organs of the respiratory system.
Alveoli-- Tiny sacs of lung tissue specialized for the movement of gases between the air and the blood. Each alveolus is surrounded by a network of capillaries. It is here that the blood picks up its cargo of oxygen from the air.

9. Moving Oxygen into the Blood
Capillaries have very thin walls.
Oxygen can move through them and into the blood from lungs.
Moves from blood to cells.
Once in blood, oxygen can be picked up by your red blood cells and carried to heart.

10. Removing Waste from your Blood
Carbon dioxide: waste made by cells.
Carbon dioxide is passed through thin wall of capillaries
Goes from cells to blood and then into air you exhale.

11. Lungs The lungs are the main organs of the respiratory system.
Inside the lungs, each bronchus divides into smaller and smaller
tubes. At the end of the smallest tubes, there are small structures
that look like grapes. They are called Alveoli.

12. The Path of Air--Review
The entrance that moistens and warms air as it enters the body.

13. chamber behind the nose & mouth that leads to the esophagus and trachea
Pharynx

14. carries air to the lungs and is protected by a flap of tissue called the epiglottis.
Trachea

15. Also called the voice box, it has 2 folds of tissue that vibrate to make sound.
Larynx

16. 2 main tubes of the lungs that the trachea divided into
Bronchi

17. air sacs located at the end of the tubes in the lungs that look like grapes
Alveoli
What surrounds the alveoli?
capillaries

18. Name______________________________
Ticket Out
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Refer to your notes. Describe the path that air takes when you breathe.