Lesson 12 Notes.docx - Lesson 12 Notes Types of Skeleton Hydrostatic Skeletons o Fluid filled central cavity surrounded by muscles Soft bodies

Lesson 12 Notes.docx - Lesson 12 Notes Types of Skeleton...

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Lesson 12 Notes Types of Skeleton - Hydrostatic Skeletons o Fluid filled central cavity surrounded by muscles Soft bodies terrestrial and aquatic invertebrates - Exoskeletons o Rigid outer covering that protects internal organs and attachment site for muscles Arthropods - Endoskeletons o Rigid internal elements that provide a framework and attachment points for muscles Echinoderms and vertebrates Musculoskeletal Action in Earthworms - Hydrostatic skeleton using two sets of muscles against a fluid filled body cavity - Contraction of circular muscles pressurizes the fluid - Contraction of longitudinal muscles causes bristle like external structures called Chaetae to protrude and hold the body in place - Contraction of these two muscles allow for movement Exoskeleton Made Out of Chitin - Arthropods and insects such as crustaceans have an exoskeleton made of the polysaccharide chitin. - Not as strong as a bony skeleton - Completely incases the muscles and internal organs, limiting growth of the animal -
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  • Fall '19
  • Collagen, Endochondral ossification, Bone- Specialized Connective Tissue

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