Closed circulatory system: The blood is maintained/enclosed in vessles. An example of this would be any vertibrates
Open circulatory system: The blood is not constantly contained in vessles, it can flow into the body cavity, haemocyoel (blood space). An example of this would be an insect.
Single circulatory system: The blood goes to the lungs/ gills to be oxygenated but doesn't return to the heart like in a double circulatory system it flows directly to the rest of the body.
Double circulatory system: This system has two curcits: Pulmonary circulatation(to and from the lungs) and systemic circulation(to and from the rest of the body).
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