In the bronchial tree, the lobar bronchi branch directly into

A) terminal bronchioles.
B) secondary bronchi.
C) primary bronchi.
D) bronchioles.
E) segmental bronchi.

During the cardiac cycle, which mechanical event immediately follows atrial repolarization?

A) Atrial systole
B) Ventricular diastole
C) Ventricular systole
D) Atrial diastole
E) Diastole of all four heart chambers