When reaching for an object, which Brodmann's area(s) are involved in knowing the physical properties of the object?

The EKG is a recording of the

A) brain's electrical activity. B) heart's electrical and mechanical activity. C) heart's mechanical activity. D) heart's electrical activity.

The iris of the optical microscope is ____. 

A. the platform that holds the specimen slide B. the controls that bring the objective being examined into focus C. the eyepiece through which you view an image D. a diaphragm that opens and closes to change the amount of light illuminating the specimen E. the mechanism that controls left-right and forward-backward movement of the stage