Calcium carbonate
Ossicles
Ossicles
Echinoderms have an Endoskeleton made up of 95 % calcium carbonate.
The internal framework of animals is also called the skeleton. Skeletons are comprised of bone which is a hard tissue that can store calcium.
Endoskeleton
Support, protection, movement, storage (calcium), and blood cell formation.
Many of the bones were made in the form of cartillage that then ossified (turned to bone). Other bones were formed from membranes, most notable the skull. The methods of formation are called endochondrial and intramembranous developement respectively.Before your birth your skeleton were not formed, calcium leads to the formation of the bone of your skeleton.
Echinoderms are a phylum with usually 5 fold symmetry, spines and calcium carbonate plates.
Echinoderms are not 'grouped' with the starfish and sea urchins. Rather echinoderms are the animal phylum to which starfish and sea urchins belong to. Star fish belong to the class Asteroidea and sea urchins belong to the class Echinoidea. There are other echinoderm classes such as sea cucumbers (Holothuroidea) and brittle stars (Ophiuroidea) are two of them. All these classes fall under the Echinoderm phylum. All echinoderms share some distinguishing features: 1. Their adult bodies are arranged in five equal parts 2. They have an internal calcium carbonate skeleton 3. They have a mouth, but no head or brain (they do have a nervous system) 4. They can posses tube feet for locomotion 5. They posses a internal hydraulic system consisting of tubes of sea water to regulate the body's internal pressure and to control movement feeding and respiration.
Support: ex. pelvis supports internal organsProtection: Skull protects brain, vertebrae proctects spinal cordMovement: Skeletal Muscles pull against bonesMineral Storage: Calcium and PhosphateHematopoiesis: Blood formation
It is the calcium-rich system of bones that supports the animal's body.
No. echinoderms have no exoskeleton.Related Information:Echinoderms are deuterostomes, a group belonging to the Phylum, Chordata but separate from the vertebrates, also of this phylum. While there is a close relationship between the echinoderms and the vertebrates, echinoderms are endoskeletal invertebrates.