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Friday, 4 January 2019

Skeletons




 • The Main skeletal materials are chitin, cartilage and bones.

 • Hydrostatic skeleton, exoskeleton and endoskeleton are the main types of skeleton found in animals.

 • Vertebrate skeletons are built on the same basic plan. The skull, vertebral column, sternum and ribs form the axial Skeleton, while the Lin girdles and limbs form the appendicular skeleton.

 • The Limbs of terrestrial vertebrates are built on a basic pentadactyl plan.

 • Joints allow movement. The main movable joints are ball and socket joint, hinge joint, gliding or sliding joint and pivot joint.  
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