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Which component of bone is primarily responsible for its tensile strength?

Clinical application: Reverse total shoulder arthroplasty is a means of regaining shoulder function after losing function at the rotator cuff. Which of the following is TRUE about reverse total shoulder arthoplasty?  

The femoral zone of weakness:

In the photo below the humerus is in:  

True or False: The elbow extensors attach further away from the elbow joint center than the elbow flexors.

True or False; The lumbar spine bears more weight and stress than thoracic and cervical spine

What are the following labels? 

A person stands still on a force plate.  What is the vertical force measure?

On the image below representing muscular tension vs. musuclar length, which term represents letter A.   

Pronation during gait: