Common Features of Circulatory Systems
- Have a liquid transport medium.
- Vessels that carry the transport medium.
- Pumping Mechanism to move the fluid.
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Open Circulatory System
- Very few vessels.
- Pumped straight from the heart into the body cavity, haemocoel.
- Comes into direct contact with the tissues and cells.
- Returs through an open-ended vessel.
- Transport medium usually carries food and nitrogenous waste, gaseous exchange occurs in the tracheal system.
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Single Closed Circulatory System
- Blood travells once through the heart.
- Passes through two sets of capillaries.
- Blood system is low after passing through both so returns slowly, not efficient.
- Fish can be active with a single closed due to their countercurrent gaseous exchange mechanisms. Their body weight and temperature regulation is sorted out due to the properties of water reducing metabolic demands.
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Double Closed Circulatory System
- Blood is pumped from the heart to the lungs picking up oxygen and unloading carbon dioxide, and then returns to the heart.
- Blood flows through the heart and is pumped out to travel all around the body before returning to the heart again.
- Only passes through one capillary network each time so a relatively high pressure and fast flow of blood can be maintained.
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