When performing auscultation of the heart sounds, what does S1 signify within a heart's contraction?
a. Pulmonic and aortic valve closing
b. Pulmonic and aortic valve opening
c. Tricuspid and mitral valve closing
d. Tricuspid and mitral valve opening
Answer: c. Tricuspid and mitral valve closing
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Serpentine cording is observed on an acid-fast stain from liquid medium. This organism is most likely
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10 100 1,000 10,000