Clam Circulatory System
The Clam has an open Circulatory System, but with an exception, which mean that there blood does not travel through veins or arteries. They just go directly to the clams organs. The blood travels through the body in open sinuses. The blood travels through the heart, past the digestive system, where it then picks up nutrients. The blood then travels through the gills where oxygen is distributed to the blood. When the heart beats, it pulls oxygenated hemolymph, inside the gills. It then travels to the heart. This is one part of the Clams circulatory system that is closed. Clams are also unable to regulate their body temperature. So when it is colder, there metabolism slows greatly.