Figure 2-2. Diagram of the cell.
g. Endoplasmic Reticulum (Figure 2-2). The endoplasmic reticulum is a
network of tubules and vesicles (saclike structures) in the cytoplasm. The inside of the
tubules and vesicles is filled with endoplasmic matrix, a fluid medium, which is different
from the fluid outside the endoplasmic reticulum. In the matrix, there are enzyme
systems. The first function of the endoplasmic reticulum is to use these enzymes to
synthesize various substances (that is, lipids). The endoplasmic reticulum is connected