Brine shrimp
Brine shrimp circulatory and respiratory systems work together to remove extra salt from their body and distribute oxygen. They breathe through gills on their feet. The oxygen taken in is carried through the bloodstream. The heart pumps the blood around the body. Brine shrimp have a protein called hemoglobin in their blood. This helps the oxygen to be more efficiently transported to cells around the body. They need hemoglobin because oxygen levels can be very low in salty water. Then, the gills pump the excess salt, water, and carbon dioxide out of the body. Additional salt is pumped out through exocrine glands.