Humans and other vertebrate animals are some examples of coelomate animals. Coelomate animals are those whose body structure is based on a body cavity lined on the inside and around the gut by mesoderm.
The presence or absence of a coelom is one of the primary methods by which animals are grouped in zoology. A coelom is the cavity, filled with fluid, that is between the animals body wall and the alimentary canal.
Some examples of a coelum in humans are the peritoneal cavity in the abdomen and similar cavity spaces around the heart and lungs. Coelomate animals also have mesenteries suspending the body organs within the coelom.