determine the parts and functions of the respiratory system.

1. The Respiratory System

2. determine the parts and
functions of the
respiratory system.
1
At the end
of the
lesson, you
should be
able to:

3. • Respiration - the process
involved in the exchange of
oxygen and carbon dioxide in
organisms.
• It can be divided into breathing
and cellular respiration.
Respiration
Respiration in humans

4. Breathing
• A process where the air from
the atmosphere is
transported into the lungs.
• At the same time, carbon
dioxide from the organism is
returned to the environment.
Stages of Respiration
Breathing process

5. Cellular Respiration
• The cells convert energy from glucose from the food that we
eat into adenosine triphosphate (ATP).
Stages of Respiration
Cellular respiration

6. Upper Respiratory Tract
• Nostrils serve as the
opening to the respiratory
tract.
• Pharynx connects mouth
and nasal cavity to the
esophagus.
Parts of the Respiratory System
Parts of the respiratory system

7. Upper Respiratory Tract
• Epiglottis is a flap of
cartilage that opens during
respiration.
• Larynx, also known as the
voice box, is involved in
sound production.
Parts of the Respiratory System
Parts of the respiratory system

8. Lower Respiratory Tract
• Trachea connects the
larynx and pharynx to the
lungs.
• Bronchi are air
passageway from trachea
to the lungs.
Parts of the Respiratory System
Parts of the respiratory system

9. Lower Respiratory Tract
• The bronchi branch into
smaller tubes known as
bronchioles.
• Lungs are the main organ
for respiration.
Parts of the Respiratory System
Parts of the respiratory system

10. Lower Respiratory Tract
• Alveoli are tiny sac-like
structures present at the
end of bronchioles.
• Diaphragm is a muscle
that expands or contracts
when breathing.
Parts of the Respiratory System
Parts of the respiratory system

11. The respiratory system is important for respiration.
Respiration starts as you breathe in air into your
lungs.
1
There are two stages of respiration: breathing and
cellular respiration.
2
3 The respiratory system can be divided into upper and
lower respiratory parts.

12. Label the following
parts of respiratory
system.

13. The alveoli are a sac-like
structure that can double
its size through expansion
when it contains air. What
do you think is the reason
for the expansion of these
structures as you breathe
in?