Dahlia is examining a model of a city that represents the organelles within the cell.

Which city part represents the smooth endoplasmic reticulum?

A.
a factory, which builds the materials used within the cell

B.
the airport, which carries materials out of the cell

C.
the railroad and its trains, which carry materials within the city

D.
the mayor's office, which manages the city

E.
the recycling plant, where used materials are broken down for reuse

The correct answer is A. a factory, which builds the materials used within the cell. The smooth endoplasmic reticulum is responsible for synthesizing lipids and detoxifying substances in the cell. The process is similar to a factory producing materials within a city.