Pen & Share
Draw on or annotate any chosen screen with the Pen tool, and share views from the app via e-mail, Facebook, Twitter or add an image to iPhoto.
The 3D model can be simply manipulated using finger gestures: spread to zoom in; drag two fingers to pan; pinch to zoom out; and drag to rotate.
Tap on a structure to select it, and to access the view options for each structure.
Turning Systems On / Off
Muscle layers can be added or removed by tapping the 'Add Muscle' or 'Remove Muscle' icons.
Change the app's background color, configurations and turn on/off or customize the Control Menu.
Quiz yourself on any of the app's systems. Also, select subsystems to refine the content of your quiz.