Question

Body cavity between the body and internal organs is called?

Answer 1

Hint: The body cavity is present between the body and internal organs to provide support to the internal organs. This body cavity is also used for the diffusion of gases and metabolites, etc.

Complete answer:
The body cavity between the body and internal organs is called coelom.
The coelom is the main body cavity in most animals that surrounds the digestive tract and other organs. Animals were classified into three groups i.e., acoelomates, pseudocoelomates, and coelomates; based on the type of body cavity they possess.
Acoelomates: lack fluid-filled body cavity between the body wall and digestive tract, instead, semi-solid mesodermal tissues between the gut and the body wall helps in holding their organs in place. In these animals, a large surface area to volume ratio because of the dorso-ventral flattening allows the absorption of nutrients and gas exchange by diffusion alone. Examples include Platyhelminthes (flatworms).
Pseudocoelomates: have a false cavity or pseudocoelom which is a fluid-filled body cavity that is not lined or partially lined with the tissue derived from mesoderm. This cavity helps in the distribution of nutrients, excretion of wastes, and as a hydrostatic skeleton to support the body. They are also called blastocoelomates and include roundworms.
Coelomates: have a true body cavity or coelom that is completely lined by the peritoneum derived from the mesoderm. This complete lining by the mesoderm helps in the attachment of organs to each other so that they can be suspended in a particular order while being able to move freely in the cavity. Examples include annelids, arthropods, echinoderms, chordates, etc.

Coelom is the answer for the given question.

Note: The coelom is the cavity of the body that can provide a hydrostatic skeleton or absorb shock. The coelom also allows muscles to grow independently of the body wall. The animals are divided into three groups i.e., acoelomates, pseudocoelomates, and coelomates; based on the type of body cavity they possess.