1. Learning Target: Identify the function of the respiratory system Science Starter: 1. vena cava to the lungs pulmonary vein back to the body

2. Warm-Up Fill in the blanks in blood’s path through the heart:
from the body
1. vena cava
2.____
3.____
4.____
to the lungs
5. pulmonary vein
6.____
7.____
8.____
back to the body
Fill in the blanks in
blood’s path through
the heart:
Heart Diagram

3. Homework Question of the Day
Worth the Wait forms are due FRIDAY

4. Respiratory System

5. Functions of the Respiratory System
Supply oxygen to the blood
Remove carbon dioxide from the blood

6. What is the function of the respiratory system?
To provide oxygen & carbon dioxide to the body cells.
To provide carbon dioxide to body cells & remove oxygen.
To provide oxygen to body cells & remove carbon dioxide.
To remove oxygen & carbon dioxide from the body cells. 1 2 3 4 5

7. Organs of the Respiratory System
Nose & Mouth
(air enters through the nostrils & mouth)
Nasal cavity = air
is cleaned, warmed,
and moistened

8. Organs of the Respiratory System
Throat
Pharynx =
passageway for both
food and air

9. Organs of the Respiratory System
Throat
Epiglottis = flap that
closes over the
larynx when
swallowing to keep
food & water out

10. Organs of the Respiratory System
Throat
Larynx = air only;
vocal chords are
attached here

11. Organs of the Respiratory System
Throat
Trachea (windpipe) =
c-shaped rings of
cartilage keep it
open all the time

12. Which of these does the nasal cavity NOT do to inhaled air?
Clean
Warm
Moisten
Condense 1 2 3 4 5

13. What is the flap called that prevents food from entering the larynx?
Pharynx
Epiglottis
Larynx
Trachea 1 2 3 4 5

14. What is the first structure that only air can pass through (not food)?
Mouth
Pharynx
Larynx
Trachea 1 2 3 4 5

15. Organs of the Respiratory System
Lungs
(where oxygen &
carbon dioxide are
exchanged)

16. Organs of the Respiratory System
Lungs
(where oxygen &
carbon dioxide are
exchanged)
Bronchi = 2 small
branches at end of
trachea; carry air
into lungs

17. Organs of the Respiratory System
Lungs
(where oxygen &
carbon dioxide are
exchanged)
Bronchioles =
smaller branches
off of bronchi

18. Organs of the Respiratory System
Lungs
(where oxygen &
carbon dioxide are
exchanged)
Alveoli = tiny, grape-
like sacs at the end
of bronchioles;
surrounded by
capillaries

19. Organs of the Respiratory System
Diaphragm
(muscle below the
lungs that helps move
air in and out of the
body)

20. What is this structure called?
Diagram
Diagonal
Diaphoresis
Diaphragm 1 2 3 4 5

21. What causes you to exhale?
Your lungs contract to squeeze the air out.
Your diaphragm moves up, pushing air out of the lungs.
Your ribs squeeze the air out of your lungs.
Your diaphragm moves down, letting air escape from your lungs. 1 2 3 4 5

22. Gas Exchange in the Lungs
Takes place between alveoli and capillaries

23. Gas Exchange in the Lungs
Takes place between alveoli and capillaries
INHALE
oxygen enter body
into alveoli
into capillaries
into blood
to body cells

24. Gas Exchange in the Lungs
Takes place between alveoli and capillaries
EXHALE
leaves body
into alveoli
into capillaries
into blood
CO2 from body cells

25. Where does the exchange of oxygen and carbon dioxide occur?
The heart
The alveoli
The pharynx
The body cells

26. What carries the blood back to the heart after it picks up oxygen from the alveoli?
Lungs
Aorta
Pulmonary artery
Pulmonary vein

27. Plickers