Beta-blockers have what effect on heart rate and contractility?

A) Decreased heart rate and increased contractility B) Increased heart rate and decreased contractility
C) Decreased heart rate and contractility D) Increased heart rate and contractility

C

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Convert the ratio 10:15 to a fraction and reduce to the lowest terms:

A) 10/15 B) 3/5 C) 2/5 D) 2/3

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Which of the following is a childhood disease that can last for several weeks or even months and is highly contagious and potentially fatal, but also preventable by vaccine?

A) Whooping cough B) Pneumonia C) Asthma D) Hepatitis

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