Wednesday, February 28, 2007

Internal Transport

Cnidarians do not have any defined circulatory system that is to sat that there is no organized internal transport. Instead most cnidarians have a long gastrovascular cavities that help carry partially digested food throughout there body. The do not have any blood. Jellyfish have the gellatinous material throughout their body. This gel has been proven to be an oxygen storage for jellyfish. This amazing storage system was one of the main reasons jellyfish survived in the prehistoric ocean's where oxygen levels were drastically lower than what we know today.

Cnidarians use the free flowing water to respire and remove waste product by diffusion through their thin body walls.