Exoskeletons are made up of strong, rigid parts that serve a variety of functions in animals. These functions include defense, elimination, sensing, support, feeding, and acting as a barrier against desiccation in terrestrial organisms. Exoskeletons play a part in supporting and in providing a framework for the attachment of musculature, as well as in protection from pathogens and predators.
Chitin is a component of the arthropod Exoskeleton; calcium carbonate makes them stronger and harder at the expense of adding weight.
Muscles are attached to the exoskeleton of arthropods at growths known as apodemes. These chitin-based structures are roughly six times stiffer and twice as strong as vertebrate tendons.
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