The Cardiovascular System of CrabsTrue crabs have an open circulatory system. The needed nutrients that are absorbed are sent throughout the body by this system. The exchange of gas is normally through the gills, which are attached to the appendages of the body. In crabs that go on land, their gills are almost like lungs, because they can fill with air, but they have to remain moist. True crabs have a heart, and blood enters the hear by means of four openings. The heart beats rapidly to make blood circulate throughout the body.
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