1 Pseudocoelomate animals have a pseudocoelom (literally âfalse cavityâ), which is a fully functional body cavity. 2  Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals.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 highly contagious, life-threatening disease with no cure, and while there are vaccinations to prevent it available, ahead of World Polio Day, the World Health Organisation is now advising countries prepare to give out lower doses to make stocks last. 07:50, Mon, Oct 24, 2016 | UPDATED: 09:56, Mon, Oct 24, 2016. GETTY.
Polio affects the central nervous system and spinal cord. It can cause muscle weakness and paralysis. Polio is a life threatening condition because it can paralyze the muscles that help you breathe. The polio vaccine is used to help prevent these diseases in children and adults. This vaccine works by exposing you to a small dose of the virus, which causes the body to develop immunity to the disease.