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Circulatory
System
Chapter 37
Circulatory System
• Heart
• Blood Vessels
• Blood
Heart
• Atrium
– Upper Chambers that receive blood
• Ventricles
– Lower Chambers that pump blood out
of the heart
• Myocardium
– Powerful heart muscles that pump
blood
• Valves
– Flaps that prevent blood backflow
Pulmonary Circulation
• Involves the lungs
1. Start at the RIGHT side of the
heart
2. Blood pumped from the heart to
the lungs
3. At the lungs, blood release CO2
and receives O2
Systemic Circulation
1. O2 rich blood goes to the LEFT
side of heart
2. Blood is pumped to the rest of the
body
3. Tissues and cells of the body
receive O2 and blood receives CO2
waste
4. Starts over at the RIGHT side for
Pulmonary Circulation
Pacemaker
•
Sinoatrial Node (SA Node)
Located at the top of the Right
Atrium
1. Impulse spread from SA Node to
fibers around Atria, contracts
2. Atrioventricular Node (AV Node)
picks up impulse
3. Impulse spreads to fibers around
ventricles, contracts
Blood Vessels
• Aorta
– Large artery of the heart and leads blood to
body
• Arteries
– Carries O2 rich blood to tissues of body
– Pulmonary Arteries carry deoxygenated blood
to lungs to become oxygenated
• Capillaries
– Smallest vessels where O2 and CO2
exchange occurs at the tissues
Blood Vessels
• Veins
– Brings de-oxygenated blood back to
the heart
– Valves to prevent backflow and
encourage blood to return to the heart
– Near skeletal muscles
• Muscle Contraction encourages blood to
pump back to the heart