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Human Anatomy and Physiology

Do sponges have a open or closed circulatory system?

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April 08, 2010 8:17PM

they have a closed circulatory sytsem:]

yur welcome

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Sorry, this answer is very incorrect. A closed circulatory system means that the blood is contained within blood vessels, which the heart is able to pump/move through the tissues for very efficient gas exchange. Sponges DO NOT have this. In fact sponges do not even technically have a circulatory system at all, gas exchange is achieved by diffusion from the outer cells. So this means that sponges do not have an open or a closed circulatory system, because they don't have one at all.