wfgs

1. The
Respiratory
System
CHRISTIAN O. DUCUSIN

2. Biological
Level of
Organization

3. Biological Level of Organization

4. Organs of the Respiratory System

5. RESPIRATORY SYSTEM
What is its function?
Move fresh air into your
body while removing waste
gases.

6. RESPIRATORY SYSTEM
How does it function?
Once in the lungs, oxygen is
moved into the bloodstream
and carried through your
body.

7. Why does our body
need oxygen?
The energy releasing
reactions that take
place in every single
cell requires oxygen
and glucose.

8. Breathing vs. Respiration
Breathing – movement of air in and
out of the lungs.
Respiration – also known as
cellular respiration, is the energy
releasing reaction that takes place
inside of cells. Oxygen combines
with sugar to release energy.

9. The Path of Air
1. Nose and Mouth
- air enters the nose through
the external nares (nostrils)
- moistens and heats the air
- cilia and mucus trap dirt
*Nasal and oral cavity

11. The Path of Air
2. Pharnyx (“throat”)
- passageway of food, air, or
fluid from the nose and mouth.

12. The Path of Air
2. Pharnyx (“throat”)
- site of common illnesses
such as sore throat, tonsilitis.

13. * Epiglottis
- small, movable lid that
prevents food and drink from
entering your windpipe.

15. The Path of Air
3. Larynx (“voice box”)
- Lets air pass from throat
(pharynx) to trachea to lungs.

16. The Path of Air
3. Larynx (“voice box”)
- plays a role in speech
- contains vocal cords
 vibrate with expelled air to
create sound (speech)

17. The Path of Air
4. Trachea (“windpipe”)
- connects larynx with bronchi
- carry air in and out of the
lungs

18. The Path of Air
5. Bronchi (singular: bronchus)
- two branching tubes that
connect the trachea to the lungs
- carry air to and from the lungs
*Inside the lungs, the bronchi
divide into tiny tubes called
bronchioles

19. The Path of Air
5. Bronchi (singular: bronchus)

20. The Path of Air
5. Lungs
- not hollow balloons but a
spongy organ

21. The Path of Air
5. Lungs
*pleura covers the lung surface
- At the end of the bronchioles
are hundreds of tiny air sacs or
alveoli where exchange of
gasses taking place.

22. The Path of Air
* Alveoli
- where the lungs and the blood
exchange oxygen and carbon
dioxide during the process of
breathing in and out.

24. RespiratoryMembrane(Air-BloodBarrier)
Figure 13.6

25. The Path of Air
5. Lungs

26. The Path of Air
6. Diaphragm
- large dome-shaped muscle
found under the lungs
- it moves to inflate the lungs
with air

27. The Path of Air
6. Diaphragm

28. SMOKER VS. NON-SMOKER’S LUNGS