Which neurotransmitter serves both the sympathetic and parasympathetic nervous systems?

At the end of each bronchiole is:

A. an alveoli B. a bronchial tree C. an alveolar duct D. a trachea

What time period does a day sheet cover?

A. a twenty-four-hour period B. an eight-hour office day C. a ten-hour office day D. None of these are correct.