Irrigation, or lavage, of the eye is necessary to remove foreign substances or chemicals.

The type of white blood cell that does not produce antibodies but instead attacks antigens directly is the:

a. T lymphocyte. c. IgM lymphocyte. b. B lymphocyte. d. IgD lymphocyte.

If a resultant panoramic image shows a reversed smile (frown), the likely cause is that:

a. the patient's chin was too low. b. the patient's chin was too high. c. the patient was slumped over. d. the patient's head was tilted.