1. Respiratory and circulatory system LT 6.10.6
Unit 7 Human biology
Respiratory and circulatory system LT
SWBAT describe and compare the main functions of human body systems and organs LT
SWBAT explain how at least two body systems are interdependent and function together to carry out an essential life process

2. Hook

3. IBE – JTPS (Justify-Think pair share)
When you stand up after lying down, why do your heart rate and breathing rate increase?

4. J-TPS (Justify –Think Pair Share)

5. The respiratory and circulatory systems bring oxygen and nutrients to the cells

6. The respiratory and circulatory systems work together to maintain homeostasis
What is homeostasis?
The circulatory system transports blood and other materials
arteries of the circulatory system transport O2 to the cells
veins carry CO2 to the lungs from the cells
Where do we get oxygen from?

7. The correct path of blood as it leaves the heart and returns to the heart is:
Oxygen-poor blood
Oxygen-rich blood
arteries, then
capillaries and finally
veins

8. The respiratory system (lungs) is where gas exchange occurs
What is a gas?
picks up oxygen (O2) from inhaled air
expels carbon dioxide (CO2) and water
nose
sinus
mouth
epiglottis
trachea
lungs

9. The lungs contain the bronchi, bronchioles, and alveoli
The alveoli of the lungs is where O2 is absorbed and CO2 is released
Why do we need oxygen?
alveoli
bronchiole

10. Breathing involves the diaphragm and muscles of the rib cage
When you inhale, the diaphragm moves downward
Air inhaled.
Muscles contract and
rib cage expands.
Diaphragm flattens
and moves downward.
Air exhaled.
Muscles and
rib cage relax.
Diaphragm relaxes
and rises.
Video

11. The circulatory system includes the heart, arteries, veins, and capillaries
The heart pumps blood throughout the body
The arteries move blood away from the heart
The veins move blood back to heart

12. What is the difference between veins and arteries and why are they different?
THINK BOX

13. Arteries, veins, and capillaries

14. Summary transporting blood, gases, nutrients
The three major functions of the circulatory system
transporting blood, gases, nutrients
collecting waste materials
maintaining body temperature

15. Check your understanding
Which is the correct path of blood as it leaves the heart and returns to the heart?
1. arteries-capillaries-veins
2. veins-capillaries-arteries
3. arteries-veins-capillaries
4. veins-arteries-capillaries

16. Check your understanding
The area in the lungs where O2 is absorbed and CO2 is released is in the
Alveoli
Trachea
Bronchi
bronchioles

17. Check your understanding
Oxygen diffuses from alveoli into the
Capillaries
Arteries
adjacent alveoli
bronchioles

18. The respiratory system exchanges oxygen and carbon dioxide

19. The correct path of air through the respiratory system
nose
trachea
lungs
alveoli

20. What would you call the diffusion of water?
Gas exchange in the lungs is based on three principle
O2 and CO2 (carbon dioxide) are carried by the blood
Gases move by diffusion– that is, they move from an area of high concentration to an area of low concentration
The lining of the alveoli must be moist to help gases diffuse
What would you call the diffusion of water?

21. Oxygen and carbon dioxide are carried by the blood to and from the alveoli
gas exchange take place between capillaries and alveoli
carbon dioxide diffuses from the capillaries into the alveoli
ALVEOLI
GAS EXCHANGES
alveolus
capillary
co2 o2
Co2 diffuses
into alveolus.
O2 diffuses
into blood.
capillaries

22. Hemoglobin
Oxygen binds to HEMOGLOBIN in red blood cells

23. Prior knowledge
What system regulates breathing?

24. Breathing is regulated by the brain stem.
The nervous system regulates breathing by monitoring dissolved gases (O2 and CO2) in the blood
Breathing is regulated by the brain stem.
midbrain
pons
medulla oblongata
spinal chord

25. Respiratory diseases interfere with gas exchange
Lung diseases reduce airflow and oxygen absorption
Emphysema destroys alveoli by reducing the surface area for gas exchange
Asthma causes the bronchioles to constrict
Cystic fibrosis produces sticky mucus.

26. Smoking is the leading cause of lung diseases.

27. Check your understanding
Oxygen binds to
Hemoglobin
the kidneys
the pancreas
none of the above

28. Check your understanding
Where does gas exchange take place
1. between arteries and alveoli
2. between capillaries and alveoli
3. between veins and bronchi
4. between capillaries and bronchioles

29. Interesting facts