1. RESPIRATORY
&
CRICULATORY
SYSTEM
LESSON 1:
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)
2. Our bodies are the mechanisms we
depend upon to get us through each
day. Even when at rest, it is working to
keep us alive. This special machine
relies on different systems that work
either together or separately.
Do you have any body parts that
constantly move, even while sitting still
or asleep? What are these?
3. Now, place one hand on the middle of
your chest to feel your heartbeat. Then,
your other hand just below your ribs to
feel the movement of your lungs, ribs,
and diaphragm as you breathe.
What do you know about your heart and
lungs?
How do they work?
4. Read the comic
strip.
Mr. Potato
discovered that his
students need help
in understanding
the body systems
respiratory and
circulatory systems.
Let us join them as
they unravel how
this body systems
work.
5. RESPIRATORY
SYSTEM
PART 1:
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)
7. Breathing is the process that delivers
oxygen to where it is needed in the
body and removes carbon dioxide.
All animals need oxygen to live. Land
animals get oxygen from the air.
We breathe in to allow oxygen to
move into our bloodstream and we
breathe out to remove carbon dioxide
from our blood.
8. The oxygen is carried in the blood to
all cells of the body.
And did you know that the air we
breathe out has 100 times more
carbon dioxide than the oxygen we
breathe in.
9. And what organ is in-charge when it
comes to breathing?
If you guessed your lungs, you are
right.
Your lungs make up one of the largest
organs in your body, and they work in
your respiratory system to allow you
to breathe.
10. Air flows into your body through the nose
or mouth and enters a specific pathway for
air.
These pathways carry air into our lungs.
Then these split off where they become
smaller and smaller.
In the end, the pathways are attached to
small air sacs where the exchange of
oxygen from the air for carbon dioxide
occurs.
11. RESPIRATORY SYSTEM
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)
Parts
and its
Functions
17. RESPIRATORY SYSTEM
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)
Mechanisms
of
Breathing
18. Inhalation (inspiration) and exhalation
(expiration) are the processes by which
the body takes in oxygen and expels
carbon dioxide during breathing.
You breathe with the help of the
diaphragm and the intercostal muscles
between your ribs.
19. The diaphragm is
shaped like a parachute
and located below your
lungs.
It divides the chest cavity
from the abdomen, while
intercostal muscles are
located between your
ribs.
20. Breathing in (Inhalation)
When you breathe in (inhale), your
diaphragm contracts (tightens) and
moves downward.
In this way, it could provide a bigger
space for your lungs to expand in
the chest cavity.
21. Breathing in (Inhalation)
Also, the intercostal muscles help
widen the area in the chest cavity.
They contract to pull your rib cage
both upward and outward when
you breathe.
As your lungs expand, air enters
the nose and mouth, traveling
towards your windpipe and into
your lungs.
22. Breathing out (Exhalation)
When you breathe out
(exhale), your diaphragm
relaxes and moves upward
into the chest cavity.
The intercostal muscles also
relax to decrease the area in
the chest cavity.
23. Breathing out (Exhalation)
As the space in the chest
cavity reduced, carbon
dioxide is pushed out of your
lungs and windpipe, and then
out of your nose or mouth.
