A biopsy of a periapical lesion associated with a vital tooth showed CD1a-positive round pale cells and many eosinophils. The diagnosis is:

In the human body, the urethra:

A) prevents urine from flowing back up and into the kidney. B) passes urine from the bladder to the outside of the body. C) stores urine in the body until it can be eliminated. D) refines the urine produced by the kidney.

The pacemaker that fires at 20 to 40 beats per minute is the:

A) Purkinje's network B) Bundle of His C) AV node D) SA node