What is one disadvantage of an closed circulatory system and one advantage of a open circulatory system?

Question

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Answer 1

We can see some of the disadvantages of a closed circulatory system when we think of some of the ailments that humans are prone to:

Pushing things through a closed system takes work, so when things aren't running smoothly problems develop. If you sit in one position too long, your blood can stop moving and clot up (restless leg syndrome). Your heart can give out or clots can block off the only routes that blood has to get to one organ or another... and then you're dead or badly wounded. Creatures without these things don't have these problems.

Creatures with open circulatory systems still have some of these problems (they have a heart, for example, and actually need to move their other muscles to maintain circulation too) but because they have less of the elaborations they can have a much simpler system. Blood pressure is low, so that means less risk of bleeding to death from a small injury, and sharing a common solution that can come and go as it pleases can keep all the parts of the body in more or less the same state.

The closed system is more complex but more powerful and efficient. So it goes.