Heart depending on what is counted as a chamber. The atrium and ventricle are sometimes considered "true chambers", while the others are considered "accessory chambers". Primitive fish have a four-chambered heart, but the chambers are arranged sequentially so that this primitive heart is quite unlike the four-chambered hearts of mammals and birds. The first chamber is the sinus venosus, which collects deoxygenated blood from the body through the hepatic and cardinal veins. From here, blood flows into the atrium and then to the powerful muscular ventricle where the main pumping action will take place. The fourth and final chamber is the
Berlin Heart unit. It moves the membranes, which draw blood into the blood chamber and push it back into the body. Like the heart, EXCOR blood pumps have valves which ensure that the blood only flows in one direction. The blood pumps are connected to the heart and blood vessels via silicone cannula. The EXCOR product range covers blood pumps and cannula of various sizes and types. While EXCOR Adult is specifically designed for adults, EXCOR Pediatric includes devices for young patients (from newborns to adolescents). In 2018 Chloe Caldwell became the first pediatric patient to be flown for a medical treatment