1. Respiratory System

5. Bronchus
The right and the left main bronchi are tubes that deliver air from the trachea to the lungs
Lined with cilia
(tiny hairs) to remove dust

7. Bronchioles Small branches of the Bronchi
At the end of each bronchioles is an Alveolus

8. Alveolus(alveoli) Tiny air sacs Walls are one cell thick
Location of gas exchange

9. Capillaries A network of blood vessels
Blood receives new oxygen and releases its carbon dioxide
Alveoli
Bronchiole
Capillary
Blood without oxygen, from the heart
Blood with oxygen to the heart

10. Aveolus (aveoli)

12. Protection of Lungs Pleura Pleural Fluid Ribs & Sternum
Thoracic vertebrae
Intercostal Muscles

13. Pleura Each lung is surrounded by pleural fluid for protection
Around this fluid
is a thin protective
membrane called the
pleura

14. Intercostal Muscles These muscles are located around the ribs
to aid with movement
and protection

15. Thoracic Vertebrae
These are the vertebrae that compose the back of the thoracic cavity
The ribs attach to them

16. Pretend that you are a molecule of oxygen….
Describe your path from the air in the environment to the blood in the capillaries

17. Diaphragm A large muscle at the bottom of the chest
It controls the movement
of air in and out of the lungs

19. Inhalation The diaphragm contracts down to pull air into the lungs
The ribs expand

20. Exhalation The diaphragm relaxes up to push the air(carbon
dioxide) out of the lungs
The ribs relax smaller

21. Asthma