1 Coelomate animals or Coelomata (also known as eucoelomates â true coelom) have a fluid filled body cavity called a coelom /ËsiËlÉm/ with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers).n some protostomes, the embryonic blastocoele persists as a body cavity. These protostomes have a fluid filled main body cavity unlined or partially lined with tissue derived from mesoderm.
Polio is a viral disease which may affect the spinal cord causing muscle weakness and paralysis. The polio virus enters the body through the mouth, usually from hands contaminated with the stool of an infected person.
Key points about polio in children. Polio is a very contagious disease caused by a virus. Polio is now very rare in the U.S. because of the polio vaccine. Most children who are infected with polio have no symptoms. A few have mild symptoms. In rare cases, the illness can cause severe symptoms and long-term problems.