Respiratory System

1. Respiratory and Circulatory
Systems Working with other
Organ Systems

2. Review:
Identify what system of the body is shown in each
picture then tell its function.
The digestive system breaks down the
foods we eat into energy our bodies can
use.
The skeletal system is the
body system composed of
bones and cartilage and
performs the following
critical functions for the
human body:
 supports the body.
 facilitates movement.
 protects internal organs.
 produces blood cells.
 stores and releases
minerals and fat.

3. To produce egg and sperm
cells. To transport and
sustain these cells. To
nurture the developing
offspring. To produce
hormones.
The respiratory system is
responsible for breathing, gas
exchange internally and externally
The circulatory or cardiovascular system serves a vital
function by delivering oxygen and nutrients to all the
organs and tissues of your body.

4. E N G A G E Activity 1: Inhale! Exhale!
Procedure:
1. Inhale and exhale for about 3 times.
2. Hold your breath for a minute.
3. Run for about 5 minutes.
Guide Questions:
1. How did you feel while doing the activity?
2. What happens to your body when you inhale?
3. What happens to your body when you exhale?
4. After you run for 5 minutes, what did you feel?
5. How running affects your breathing system?

5. O B J E C T I V E S
After this lesson, you will be able to:
1. Identify the key parts of the respiratory system.
2. Describe the functions of each part of the respiratory
system.
MELCS: Explain how the respiratory and circulatory systems
work together to transport nutrients, gases, and other molecules
to and from the different parts of the body (S9LT-Ia-b-26)

6. Guide Questions:
1. What does each part
of the bunch of grapes
represent in relation to
the human breathing
system?
2. What are the key
parts of the breathing
system?
E X P L O R E

7. Refer to the diagram and check your understanding of the breathing
system by labelling each part and giving its functions in the box
corresponding to the part.
NOSE
NASAL
PASSAGES
TRACHEA
BRONCH
I
BRONCHIOLE
S
ALVEOLI
Guide Questions:
1. How will you
describe the pathway
of oxygen in the
breathing system?
2. What will happen if
one part of the
system fails to carry
out its function
properly?

8. Guide Questions:
1. How will you describe the pathway of
oxygen in the breathing system?
2. What will happen if one part of the
system fails to carry out its function
properly?

12. Respiratory System
The respiratory system is designed to
obtain oxygen from the air and remove the
waste product carbon dioxide from the
body.
1. Respiration - the release of energy in cells
by the combination of food and oxygen

13. WA R N I N G : T E R M I N O L O G Y !
“Respiration” is used several different ways:
Cellular respiration is the aerobic breakdown of
glucose in the mitochondria to make ATP.
Respiratory systems are the organs in animals
that exchange gases with the environment.
“Respiration” is an everyday term that is often
used to mean “breathing.”

14. Respiratory System
2. Gills - organs used by water animals to
obtain oxygen from the water
3. Spiracles - holes along the abdomen of
insects used to take in oxygen
4. Carbon dioxide - a gaseous waste
product of respiration which is exhaled
from animals

16. The parts of the breathing system with their
description.
• Nose – where the air enters into the
body when we inhale.
• Nasal passageways - which are lined up
with mucous membrane and hair and
serves as filters in screening out dust
particles in the air.

17. • Mucus - are sticky substance produced by
the nose to moisten the inhaled air and
trap dust and bacteria.
• Cilia - are microscopic hairlike structures
that help move mucus and other
substances in the respiratory track.
• Esophagus - is the tube leading to the
stomach from the throat.

18. • Epiglottis - is a flap that covers the trachea
while food is swallowed; this prevents food
from going into the trachea and lungs.
• Larynx - is the part of the throat that
contains the voice box or vocal cords and it
is also referred to as “Adam’s apple because
it protrudes on man’s neck. Next, the air
moves down through the trachea, bronchi,
bronchioles and alveoli.

19. • Trachea or “windpipe” - is the tube that
leads to the lungs from the throat,
serves as passageway of air into the
lungs.
• Bronchi - is the main branches of the
respiratory tract leading into the lungs
that connects the trachea to the lungs.
• Bronchioles - are hairlike tubes that
connects to the alveoli.

20. • Alveoli - are tiny sacs at which gas
exchange takes place in the lungs.
• Diaphragm - is a muscle on the underside of
the lungs; when it contracts and relaxes, it
sets up the conditions of low and high air
pressure that permit air to be inhaled and
exhaled from the lungs. Thus, it controls the
breathing process.

21. Inhale!
What happens to your body when you inhale?
When you breathe in or inhale, the diaphragm
muscle contracts and flattens out. This allows
your lungs more room to fill up with air. Your
rib muscles also lift the ribs up and outward to
give the lungs more space.

22. Exhale!
What happens to your body when you exhale?
When you breathe out or exhale, the diaphragm
muscle relaxes and moves up, pushing air out
of the lungs. The air that you breathe out
contains carbon dioxide.

23. L E T ’ S S U M U P !

24. DO THIS!

25. Answer the following riddles.
1. RATHCAE – I am a long tube connecting your mouth to your
lungs. It is made of elastic tissue and smooth muscle.
2. XHAPRYN – I am a passageway leading to from behind the nasal
cavity to the trachea.
3. CHIBRON – The air cannot go directly into the lungs without me.
4. GLUNS – I am the main organ of the respiratory system.
5. RYNLAX – I am a rigid, box-like structure that protect the vocal
cords.
6. HIGRAMPAD – I am large, flat muscle at the bottom of the chest
cavity.
7. RAI SACS – There are 300 million of me in your lungs.
8. STIEPOLGET – I am a cartilaginous small flap at the top of the
trachea.

26. Why is the breathing
system important to living
organisms?
Breathing is important to organisms because
cells require oxygen to move, reproduce, and
function. Breath also expels carbon dioxide,
which is a by-product of cellular processes within
the bodies of animals.

27. 1. What is the advantage of breathing through your nose and not
through your
mouth?
_________________________________________________________
_______
2. What might happen to your throat when you sleep with your mouth
open
especially when you have a clogged nose?
_________________________________________________________
_______
3. You watched and cheered in a basketball game recently. Your voice
became
hoarse and you eventually suffered from laryngitis. How do you

28. Matching Type: Match Column A with B.
A B
1. Also known as windpipe a. alveoli
2. Two branching tubes b. bronchi
3. Hair-like tubes c. trachea
4. Also called as air sacs d. bronchioles
5. Organ in which the air enters and filtered e. nasal
passages
f. nose
E VA L U AT I O N

29. Complete the given words found in the word bank about the essential parts of the
respiratory system and their functions.
Respiration begins at the nose as the air we breathe goes through the
nose, nasal passages, and the trachea. Inside the nose are tiny hairs,
which filter the dust and germs from the air. (1) The _____________
serves as a channel for inflow through the nose in which the air is
warmed, cleaned, and moistened.
(2) Air goes down the trachea or ______________, a hollow tube that
serves as the passageway of air into the _______________. (3) The
trachea branches out into two pipe called _____________, one entering
each lung. (4) The bronchi subdivide many times inside the lungs,
analogous to the branching pattern of grapes, finally becoming hair-like
tubes called _____________. (5) In the last part of the terminal
bronchioles are tiny bubble-like bunch of structures called

30. EVALUATION PART 2:
1. The trachea is also known as ______________.
a. larynx c. voice cord
b. pharynx d. windpipe
2. The smaller air passages that branch out into segments of
each lobe of the lungs are called _____________.
a. arterioles c. capillaries
b. bronchioles d. tracheal systems
3. At what structures in the lungs does the exchange of
oxygen and carbon dioxide take place?
a. Alveoli c. Bronchioles
b. Bronchi d. Trachea

31. 4. Which is the pathway of oxygen to the lungs?
a. Nose-bronchi-trachea-larynx-pharynx-alveoli
b. Nose-larynx-pharynx-alveoli-bronchi-bronchiole
c. Nose-pharynx-larynx-trachea-bronchi-bronchiole-alveoli
d. Nose-trachea-bronchiole-alveoli-pharynx-bronchi-larynx
5. What is the name of this structure that serves as channel
where air
enters the body; warmed, cleaned, and moistened?
a. nasal passage c. trachea
b. mouth d. lungs