(B) In an open circulatory system,the blood is pumped out of the heart into blood vessels that open into body cavities or spaces called sinuses. These

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(B) In an open circulatory system,the blood is pumped out of the heart into blood vessels that open into body cavities or spaces called sinuses. These spaces are known as blood sinuses or haemocoel. In this system,the tissues and organs are bathed in blood,which is not confined to vessels as in a closed circulatory system.