Cis Face
Definition
The cis face is the receiving side of the Golgi apparatus where transport vesicles that have budded from the endoplasmic reticulum fuse with the Golgi membrane and empty their cargo into the lumen.
Analogy
Think of a factory's loading dock. Trucks (vesicles) arrive full of raw materials (proteins), which they unload at one specific side (the cis face) before being processed inside.
Related terms
Trans Face: The opposite side of the Golgi apparatus from the cis face. It functions as an exit point where modified proteins are packaged into vesicles to be transported to their next destination.
Lumen: The inside space of a tubular structure, such as an artery or intestine. In this case, it refers to the interior space within each stack of the Golgi apparatus where protein modification occurs.
Vesicular Transport: A cellular process that transports large particles, droplets or molecules across plasma membranes via vesicles.
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