A circulatory system in which the heart pumps blood to tissues throughout the body cavity is referred to as:

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An open circulatory system is one in which the heart pumps blood into a body cavity called a hemocoel, where it mixes with interstitial fluid and bathes the organs directly. This is different from a closed circulatory system, where the blood is enclosed within the vessels and does not directly contact the body tissues. A gastrovascular cavity is found in simple animals such as cnidarians and is used for both digestion and circulation. An incomplete circulatory system is a type of open circulatory system where there is only one major vessel and blood does not circulate as efficiently. A complete circulatory system is a type of closed circulatory system where blood circulates in a continuous loop through vessels.

A Circulatory System in Which the Heart Pumps Blood to Tissues