The last 12 feet of the small intestine are called the ________.

A symptom of fluorine deficiency is ________

A) low blood pressure B) acne C) hair loss D) dental cavities

Which one of the following is NOT a principle of shadow casting?

a. Long axes of the teeth and image receptor should be parallel to each other. b. Long axes of the teeth and image receptor should be as close to each other as possible. c. Source of radiation should be as small as possible. d. Teeth should be as close as possible to the radiation source.