The secretory process of goblet cells in the epithelia of trachea, bronchus, duode-
num, ileum, and gallbladder of rabbit was observed by SEM. It was revealed that the
process of secretion of the goblet cells might be divided into the following four steps:
1. Resting Stage: the surface of the goblet cell was lower than that of its surroun-
ding cells. In the central part of its apical surface, there were many long and densely
arranged microvilli.
2. Preseere...