The Circulatory System. Open circulatory system “Blood” is emptied into the body cavity.
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Transcript of The Circulatory System. Open circulatory system “Blood” is emptied into the body cavity.
The Circulatory System
Open circulatory system• “Blood” is emptied into the body cavity
• Advantage over open CS– Delivers blood to
depth of organ more efficiently
• Disadvantage of 2 chambers– Lack of pressure to
transport blood
Evolution of heart
• Additional atrium
• Benefit– Increases
pressure – But not enough
to provide O2 for long distance travel
Inferior Vena cava
Superior Vena cava
Subclavian VeinBrachiocephalic Vein
Renal Vein
Pulmonary Artery
Pulmonary Vein
Left Carotid Artery
BrachiocephalicArtery
Jugular Vein
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?
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?
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
•
Fetal Pig Circulatory System