1. Respiratory System

2. Respiratory System Purpose: To transports O2 and CO2 from
atmosphere to the cells
Two types
External:
use lungs to exchange gases from the air to our blood
Internal:
to exchange gases between our blood and our cells

3. Respiratory system is located in the thoracic cavity.
Lies above the diaphragm
The diaphragm is a large
sheet-like muscle that
divides the thoracic and
abdominal cavities.

4. Respiratory System
1. As you breathe in the air should enter via your nostrils/nares.
Nasal hairs filter air
Nasal chambers moistens and warms the air.

5. 2. Air then passes through the pharynx
Back of throat area/behind uvula
A common passage for food & air
3. The pharynx directs air into the larynx.
-referred to as the Adam’s Apple or Voice Box
-contains our vocal cords
-As air passes through the vocal cords these thin bands of tissue vibrate allowing you to make sounds.

6. When you swallow this flap closes making a slight sound.
4. The larynx has a flap of tissue protecting its opening called the epiglottis.
When you swallow this flap closes making a slight sound.
Purpose of the epiglottis is to prevent food from entering and blocking the respiratory pathway.

7. 5.From the larynx the air passes into the trachea.
Known as the windpipe
Approximately 4 ½ inches long
Protected by rings of cartilage
that prevents it from collapsing as
air moves in and out.

8. 6. The trachea branches to make two smaller tubes called bronchi
Bronchi direct the air into the lungs
Bronchi divide into smaller branches called bronchioles.
Bronchioles keep dividing
up to 20 times and eventually
becoming the air ducts.

9. -Bronchioles, bronchi and trachea are all lined with small hair like structures called cilia.
Cilia trap foreign particles and push them back towards the throat area.
-Air ducts empty into our air sacs or alveoli.

10. 7. -Alveoli is where our gases are exchanged
-Average human has 300,000,000 alveoli.

11. Respiratory System
Trachea
Bronchi
Bronchioles
Alveoli

12. The lungs are surrounded by a double membrane known as the pleura.
Keeps the lungs pressurized so air can move in and out.
Secretes a slippery fluid which reduces friction

13. Human lungs are made up of several lobes.
3 lobes on right side
2 lobes on left side

14. Inspiration/Inhaling:
Air moves into the lungs from the atmosphere.
Air we breathe is 21% oxygen and .03% carbon dioxide
Expiration/Exhaling:
Air moves out of the lungs into the atmosphere
Air we exhale is 14% oxygen and 5.6% carbon dioxide.

16. Lets examine how this happens……………………………..

17. Inspiration/Inhaling:
Air moves into lungs
Chest expands
Ribcage moves up and
out / expands space
Diaphragm flattens and pushes
down
Abdominal muscles relax.
Increase volume of thoracic cavity
Pressure inside the cavity is lower than outside the cavity
Air moves from high to low causing air to move into the lungs.

18. Expiration/Exhaling:
Air moves out of lungs
-Chest decreases in size
-Ribcage relaxes and moves in
-Diaphragm moves up into a
concaved shape.
-Abdominal muscles contract.
Decrease volume of thoracic cavity
Pressure inside the cavity is higher than outside the cavity
Air moves from high to low causing air to move out the lungs.

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