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KIN/Joints & Levers

Joint and lever basics.

QuestionAnswer
The 3 parts of the lever system. 1. Fulcrum: point of movement (joint). 2. Resistance: weight or force. 3. Effort: force exerted to overcome resistance.
Class 1 Lever Balanced. Example: Scull balanced on the spinal column.
Class 2 Lever Power. "Wheelbarrow". Example: the lower body area needed for forward momentum.
Class 3 Lever Greatest movement. Range of motion, flexibility. Most common in the body.
Joint The point where bones meet and movement occurs.
Classification of Joints: A. B. A. Class by function. B. Class by structure.
Class by Function: 1. 2. 3. 1. Synarthrotic: no movement. 2. Ampiarthrotic: some movement. 3. Diarthrotic: free movement.
Class by Structure: 1. 2. 3. 1. Fibrous (synarthrotic). 2. Cartilaginous (ampiarthrotic). 3. Synovial (diarthrotic)
Diarthrotic/Synovial Joints - 6 types: 1. Hinge 2. Ball & Socket 3. Pivot 4. Ellipsoid/Condyloid 5. Saddle 6. Gliding
Articular Cartilage Glass-like covering protecting ends of bones from friction while the articulate.
Fibrous Stratum Tough fibrous structure that connects bones with eachother (fibrous capsule around joint).
Synovial Stratum Membrane: secretes a viscous fluid that lubricates the joint.
Ellipsoid Joint The oval-shaped end of one bone articulating with the elliptical basin of another.
Hinge Joint Just like the door lock and the bathroom at Whidbey.
Pivot Joint Like a donut rotating around a broom handle.
Gliding Joint Occurs between 2 flat surfaces.
Saddle Joint Modified ellipsod. Composed of convex and concave articulating surfaces (like 2 saddles).
Created by: kerwin90
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