29.4 central and peripheral nervous systems set up cornell notes on pg. 61 topic: 30.3 the heart and...
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29.4 Central and Peripheral Nervous Systems Set up Cornell Notes on pg. 61•Topic: 30.3 The Heart and Circulation
•Essential Question(s):
1.On the top of pg. 60 please create a double-bubble map comparing and contrasting pulmonary and systemic circulation. Add a picture to each.
2.1 Atoms, Ions, and Molecules
30.3 The Heart and Circulation
KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.
30.1 Respiratory and Circulatory Functions
Sponge • Think about the muscles in your body:
– Do they get tired?– Hurt?– Sore?– Torn?
• Now think about your heart. Does it do these things?
30.3 The Heart and Circulation
KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.
30.3 The Heart and Circulation
The tissues and structures of the heart make it an efficient pump.
• Cardiac muscle tissue works continuously without tiring.
NORMAL HUMAN HEART
30.3 The Heart and Circulation
Regular heart vs. Enlarged Heart
30.3 The Heart and Circulation
• 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
30.3 The Heart and Circulation
1) Sinoatrial (SA) node, or pacemaker, stimulates atria to contract LUB
2) Atrioventricular (AV) node stimulates ventricles to contract DUB
SA node
VA node
• The heartbeat consists of two contractions.
Lub-dub
Lub-dub
Lub-dub
30.3 The Heart and Circulation
1. oxygen-poor blood enters right atrium
2. It pumps into the right ventricle, which pumps blood to lungs
3. oxygen-rich blood from lungs enters left atrium
4. It pumps into the left ventricle, which pumps blood to body
• Blood flows through the heart in a specific pathway.
1
2
3
4
30.3 The Heart and Circulation
Aorta
Right AtriumLeft Atrium
Right Ventricle
Left VentricleOxygen-poor blood
Oxygen-rich blood
30.3 The Heart and Circulation
30.3 The Heart and Circulation
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 waterexpelled (exhale)
– blood picks up oxygen (inhale)
– oxygen-rich blood returns to heart
30.3 The Heart and Circulation
• 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
30.3 The Heart and Circulation
• The two pathways help maintain a stable body temperature.