Chapter Three 

The centre for media giants

 a series of flattened stacked pouches called cisternae

Proteins enter at its cis face (entry face), which is a line segment between any two distinct points and usually oriented toward the nucleus. 

They are then transported through the Golgi and exit from its concave trans face (exit face)

 lumen is the space within the body's various tubes, tracts, and cavities. Air, blood, fluids, food, and other substances are transported through the lumen

secretory vesicles,

which are larger than other transport vesicles,

store their contents until specific signals direct their fusion with the plasma membrane.