Do flatworms have no Coelom and Pseudocoelom or a true Coelom?
This group does not have a body cavity (coelom) and is referred to as acoelomate. Flatworms are the first animal group to show all three tissue layers that we find in most animals (except Sponges and Cnidarians). This condition is referred to as triploblastic.
Do sponges have a true Coelom?
Sponges do not have a coelom. The body cavity of sponges is large, it is open to the outside world, and it enables the sponge to consume food (Dawkins 2004). Sponges do not have any internal organs or a nervous system.
Do Cnidaria have a true Coelom?
Cnidarians are not considered to have a coelom because they are diploblastic, so they don’t have any mesodermic tissue. Cnidaria are a phylum consisting of aquatic animals like jellyfish, anemones, and corals. Cnidaria have cnidocytes, specialized stinging cells.
What is the most complex sponge body type?
leuconoid
Are sponges Pseudocoelomate?
A pseudocoelomate is an organism with body cavity that is not derived from the mesoderm, as in a true coelom, or body cavity. A pseudocoelomate is also known as a blastocoelomate, as the body cavity is derived from the blastocoel, or cavity within the embryo. Sponges do not have a coelom.
Do sponges have a gut?
Sponges are the simplest animals. They were once thought of as plants but since they cant produce their own food, they must eat organisms, and this puts them in the animal kingdom. Sponges do not have a gut.
Why is Spongocoel not a body cavity?
The spongocoel is not a body cavity but instead exists outside external to the tissue making up a sponge’s body. This is just as gastrointestinal tracts or gastrovascular cavities too exist external to the tissues of other animals. In sponges water flows into the spongocoel from pores in the sponge’s body.
What are the two major body cavities?
The two largest human body cavities are the ventral body cavity, and the dorsal body cavity. In the dorsal body cavity the brain and spinal cord are located.
What are the 4 major body cavities?
Humans have four body cavities: (1) the dorsal body cavity that encloses the brain and spinal cord; (2) the thoracic cavity that encloses the heart and lungs; (3) the abdominal cavity that encloses most of the digestive organs and kidneys; and (4) the pelvic cavity that encloses the bladder and reproductive organs.