Answer to Question 1
ZEUS has three interactive robotic arms, one of which holds the endoscope while the other two manipulate the surgical instruments. The surgeon, sitting at a console, controls the arms. The endoscope is controlled by voice commands. The surgeon manipulates the instruments, which resemble surgical tools, while looking at a monitor; the surgeon's manipulations control the robotic arms, which are actually doing the surgery. ZEUS includes a feedback system so that the surgeon feels the tissue. The computer-controlled robotic arms also scale down the surgeon's movements, filtering out any hand tremor. This means that a 1-inch movement by the surgeon becomes a one-tenth of an inch movement of the robot's surgical instrument. By eliminating the hand's vibrations, ZEUS makes delicate procedures safer.
Answer to Question 2
D