The part of the conduction system that is located on the floor of the right atrium is the:

The principle hormonal change that underlies chronic disease associated with stress is:

a. cortisone b. norepinephrine c. thyroxin d. ADH

Intrapulpal techniques require all of the following, except

A) endodontically prepared tooth B) use of any local anesthetic is equally effective C) use of pressure anesthesia created by the volume of solution D) wide opening through the crown to permit access to the large volume of anesthetic required for success