The cardiovascular system regulates perfusion mainly by altering which of the following?
a. Capacity and resistance of blood vessels
b. Rate of cardiac contractions
c. Strength of cardiac contractions
d. Volume of cardiac contractions
ANS: A
The cardiovascular system regulates blood flow mainly by altering the capacity of the vasculature and the volume of blood it holds.
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a. 2–3 grains b. 5–10 mg c. 2–3 mg d. 10–15mg
The lead foil found within the film packet is designed to accomplish what function?
It is used to absorb some of the radiation that passes through the film and helps prevent scatter of radiation to the surrounding tissue. It is used to absorb heat generated by the gamma rays generated within the tubehead. It is provided to increase flexibility of the film packet. It is designed to deflect hard rays that are not useful in exposing radiographs.