Megaloblastic anemia is characterized by:

Which of the following types of blood vessels allow the exchange of substances directly between the blood and the cells of the body?

A) Arterioles B) Alveoli C) Capillaries D) Veins

A roentgen is considered to be what when talking about dental radiograph?

equal to one rad times the unit of absorbed dose a special unit of exposure to radiation measured in air a traditional unit of measurement equal to six coulombs of radiation