For a PA chest projection with accurate positioning, the

1. SID is set at 72 inches (183 cm).
2. shoulders are positioned at equal distances from the IR.
3. upper midcoronal plane is tilted slightly toward the IR.
4. elbows and shoulders are rotated posteriorly.
a. 1 and 2 only
b. 2 and 3 only
c. 1, 2, and 4 only
d. 1, 2, 3, and 4


A

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What effect does the sympathetic nervous system have on the heart in cases of hypoperfusion?

A. It increases the speed and strength of contractions. B. It makes the heart less responsive to medication. C. It slows the speed and decreases the strength of contractions. D. It makes the heart more likely to fail.

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Carbon dioxide diffuses across the alveolar-capillary membrane approximately how many times faster than O2?

a. 10 b. 20 c. 30 d. 40

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A high dose of organism inoculum is required to establish gastrointestinal disease for all of the following organisms except

A) Vibrio cholerae. B) Campylobacter spp. C) Shigella spp. D) Salmonella spp.

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The most powerful of third-party payors is the ______________________ ______________________.

Fill in the blank(s) with the appropriate word(s).

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