Give an account of how bending and lifting heavy objects modifies the forces on the lumbar spine.

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Robert · Accepted Answer

Lumbar spine 
Lumbar spine is located at the centre of the spinal cord as shown below:
As it is only the spinal cord which distinguishes men from animals or lizards.  
Animals or lizards are not able to stand erect because they do not have the spinal 
cord.  But we human beings are blessed with the spinal cord which help us stand  
erect, bend or lift weights, etc.
The spinal cord’s behavior can be compared to that of a mechanical lever balanced  
at the fulcrum with two weights on either side of the fulcrum.

Give an account of how bending and lifting heavy objects modifies the forces on the lumbar spine.

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