4.1.1.A Joints - Activity 4.1.1 Bones Joints Action Introduction The human body can carry out an incredible variety of movements from typing a letter or

4.1.1.A Joints - Activity 4.1.1 Bones Joints Action...

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Activity 4.1.1: Bones, Joints, Action! Introduction The human body can carry out an incredible variety of movements, from typing a letter or playing a video game to riding a bike or flipping on a trampoline. Body movements, large or small, require the coordinated action of our muscles and our bones. With only one exception (the hyoid bone in the throat), every bone in the human body meets up with at least one other bone at junctions called joints . Our skeletons are rigid and offer great protection and support, but thanks to joints, they are also flexible and allow for a great range of motion. Without joints, we would be unable to bend and flex. Joints can be classified by either their structure or their function. Functionally, joints are classified by how much motion they allow. Some joints permit very little movement, but are very strong and durable. Immovable joints and slightly movable joints are restricted mainly to the axial skeleton where protection and stability are key. Other joints provide a greater degree of motion, but do not provide as much strength. Freely movable joints are found on the appendicular skeleton and permit flexibility in the limbs. Structurally, joints are classified as fibrous, cartilaginous, or synovial. These classifications are based on whether there is fibrous tissue, cartilage or a fluid filled cavity separating the bony ends of the joint. Sutures in the skull are fibrous joints that connect the bones that shield your brain. The pubic symphysis, the piece of cartilage at the bottom of the pelvic bone, is actually a slightly moveable cartilaginous joint. While all of the types of joints play a role in movement and protection of the human frame, this activity will focus on synovial joints, freely moveable joints. It is these joints and the oily fluid-filled cavity that separates the bones that allow us to swing our arms or jump up and down.
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  • Fall '16
  • Berkley
  • joints, Laboratory journal, Synovial joint

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