Pillbugs, also known as sowbugs, or woodlice, are familiar backyard creepy crawlies to most of us. Pillbugs are correctly. classified as terrestrial Isopods, and belong to the Class Crustacea. Familiar crustaceans include lobsters, crabs, shrimp, and daphnia (water fleas). The crustaceans, in turn, are part of a larger group, Arthropoda, or jointed-legged animals.
Video: Heart and circulatory system. Your heart is a pump. It's a muscular organ about the size of your fist and located slightly left of center in your chest. Your heart is divided into the right and the left side. The division protects oxygen-rich blood from mixing with oxygen-poor blood. Together, your heart and blood vessels comprise your cardiovascular system, which circulates blood and oxygen around your body. Your heart pumps about 5 quarts of blood every minute.
Syringomyelia (sear-IN-go-my-EEL-ya) is a chronic disorder involving the Spinal Cord in which a fluid filled cavity (or cyst) forms within the Spinal Cord. This cyst (called a Syrinx) expands and elongates over time, destroying the center of the Spinal Cord. As the nerve fibers inside the Spinal Cord are damaged, a wide variety of symptoms can occur, depending upon the size and location of the Syrinx.