1. 30.3 The Heart and Circulation
Set up Cornell Notes on pg. 49
Topic: 30.3 The Heart and Circulation
Essential Question(s):
On the bottom of pg. 48 please create a double-bubble map comparing and contrasting pulmonary and systemic circulation. Add a picture to each.
30.3 The Heart and Circulation
2.1 Atoms, Ions, and Molecules
KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.

2. KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.

3. Points to Ponder
Think about the muscles in your body:
Do they get tired?
Hurt?
Sore?
Torn?
Now think about your heart. Does it do these things?

4. heart pumps blood throughout body
REVIEW
The system includes :
heart pumps blood throughout body
arteries move blood away from heart
Oxygen-rich blood
veins move blood back to the heart
Oxygen-poor blood
capillaries get blood to and from tissues
*Where gas, water, and nutrient exchange occur
Blood Vessels

5. Blood pressure is a measure of the force of blood pushing against artery walls.
High blood pressure can precede a heart attack or stroke.

6. The tissues and structures of the heart make it an efficient pump.
Cardiac muscle tissue works continuously without tiring.
NORMAL HUMAN HEART

7. The heart has four chambers: two atria, two ventricles.
Valves in each chamber prevent backflow of blood.
Muscles squeeze the chambers in a powerful pumping action.
aortic valve
left atrium
mitral valve
left ventricle
septum
pulmonary valve
right atrium
tricuspid
right ventricle

8. The heartbeat consists of two contractions.
1) Sinoatrial (SA) node, or pacemaker, stimulates atria to contract LUB
2) Atrioventricular (AV) node stimulates ventricles to contract DUB
Lub-dub
SA node
VA node

9. Heartbeat contractions

10. Blood flows through the heart in a specific pathway.
oxygen-poor blood enters right atrium from the body
2. Blood pumps into the right ventricle, which pumps blood to lungs to pick up O²
3. oxygen-rich blood from lungs enters left atrium
4. Blood pumps into the left ventricle, which pumps blood to the body 3 1 4 2

11. Oxygen-poor blood Aorta Oxygen-rich blood Right Atrium Left Atrium
Left Ventricle
Right Ventricle
To the body

14. Two main pathways of blood
Systemic circulation
Pulmonary circulation

15. The heart pumps blood through two main pathways.
Pulmonary circulation occurs between the heart and the lungs.
oxygen-poor blood enters lungs
excess carbon dioxide and water expelled (exhale)
blood picks up oxygen (inhale)
oxygen-rich blood returns to heart

16. Systemic circulation occurs between the heart and the rest of the body.
oxygen-rich blood goes to organs, extremities (arms/legs)
oxygen-poor blood returns to heart

17. The two pathways help maintain a stable body temperature.

18. Divide the top of pg. 48 Into 4 equal sections
Intro to Circulatory System
1m20s
How the Circulatory System Works
Slim Goodbody  3m
Circulatory System
1m56s
Blood Circulation
2m48s
5 bullets each video

19. Lifestyle plays a key role in circulatory diseases.
Some choices lead to an increased risk of circulatory diseases.
smoking
long-term stress
excessive weight
lack of exercise
diet low in fruits and vegetables, high in saturated fats

20. Circulatory diseases affect mainly the heart and the arteries.
artery walls become thick and inflexible
plaque blocks blood flow in arteries
Plaque
Artery wall

21. Regular heart vs. Enlarged Heart

22. Review: Use your Notes from Friday to help you
Name the four chambers of the heart
Explain the path of the oxygen-poor blood
Explain the path of the oxygen-rich blood
When the oxygen-poor blood enters the lungs what does it drop off and pick up?

23. Right atrium, right ventricle, left atrium, left ventricle
Name the four chambers of the heart
Right atrium, right ventricle, left atrium, left ventricle
Explain the path of the oxygen-poor blood
Enters the right atrium from the body, to right ventricle, to the lungs
Explain the path of the oxygen-rich blood
Enters from the lungs into the left atrium, to the left ventricle, and out to the body through the aorta
When the oxygen-poor blood enters the lungs what does it drop off and pick up?
Drops off carbon dioxide and water vapor and picks up oxygen

24. Crash Course: Respiratory and Circulatory System (12m)

25. Aorta
Left Atrium
Right Atrium
L. Ventricle
Right Ventricle

26. From the body
To lungs
To lungs
From the body

27. To the body
From lungs
From lungs
To the body

28. To the body
From the body
To lungs
To lungs
From lungs
From lungs
From the body
To the body