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Which structure in the eye that contains smooth muscle fibers responsible for controlling the amount of light passing through its central opening?

This part of the PNS conducts nerve impulses from the CNS to skin and skeletal muscles is the:

In what direction does the lateral rectus muscle move the eye? 

True or false: there is a positive correlation between joint mobility and joint stability (that is, as a joint is more mobile it is also stronger)

What is the muscle circled below?  

Which joint below is an example of a gomphosis?

What type of joint occurs between most wrist and ankle bones?

What type of vertebra is shown below?  

What is the most likely sex of this pelvis?

What kind of joint is the articulation between the radius and the ulna?