In the standard leads I, II, and III used in this lab exercise, which location is used as the ground?

A) The left ankle
B) The right wrist
C) The right ankle
D) The left wrist
E) Either wrist or either ankle can be used as the ground.

Which type(s) of receptor is(are) found in the retina?

A) rods and cones
B) organ of Corti
C) muscle spindles
D) olfactory cells
E) hair cells in ampullae