An internal skeleton or supporting framework in an animal is called what?

An internal skeleton or supporting framework in an animal is called what?

• A. Pseudocoelom
• B. Coelom
• C. Exoskeleton
• D. Endoskeleton

Answer: (D)

An internal skeleton is known as an endoskeleton. It provides a sturdy internal framework inside the body—bones or cartilage that muscles pull against to create movement and that also store minerals. The other terms refer to different ideas: a coelom is a fluid-filled body cavity housing organs and is not a skeleton, a pseudocoelom is a related but not skeletal cavity, and an exoskeleton is a hard exterior covering that supports the body from outside. So the internal skeleton that supports the organism from within is the endoskeleton.

An internal skeleton is known as an endoskeleton. It provides a sturdy internal framework inside the body—bones or cartilage that muscles pull against to create movement and that also store minerals. The other terms refer to different ideas: a coelom is a fluid-filled body cavity housing organs and is not a skeleton, a pseudocoelom is a related but not skeletal cavity, and an exoskeleton is a hard exterior covering that supports the body from outside. So the internal skeleton that supports the organism from within is the endoskeleton.