the circulatory system. open circulatory system “blood” is emptied into the body cavity
TRANSCRIPT
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The Circulatory System
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Open circulatory system• “Blood” is emptied into the body cavity
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• Advantage over open CS– Delivers blood to
depth of organ more efficiently
• Disadvantage of 2 chambers– Lack of pressure to
transport blood
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Evolution of heart
• Additional atrium
• Benefit– Increases
pressure – But not enough
to provide O2 for long distance travel
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Inferior Vena cava
Superior Vena cava
Subclavian VeinBrachiocephalic Vein
Renal Vein
Pulmonary Artery
Pulmonary Vein
Left Carotid Artery
BrachiocephalicArtery
Jugular Vein
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Closed Circulatory Systems
• Two sections for gas exchange– Pulmonary – Systemic
• One location for pumping blood– Two chambers• Receiving : Atrium
– Coming in from veins• Pumping : Ventricle
– Going Away Arteries
• Problems with this design?
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Closed Circulatory Systems• 2 sections for gas exchange• 1 location for pumping
blood– Three chambers
• Receiving : Atria– Right A. Coming in from body
veins– Left A. Coming in from lungs
• Pumping : Ventricle– Going Away to body – Going Away to lungs
• Problem with Design? • Advantages?
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Closed Circulatory Systems
• Four chambers– Receiving : Atria
• Right A. Coming in from body veins
• Left A. Coming in from lungs
– Pumping : 2 Ventricles• Left V: Going Away to body • Right V. Going Away to lungs
•
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Fetal Pig Circulatory System
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