Endoplasmic Reticulum

The endoplasmic reticulum is a network-like structure formed by the folding of the cytoplasmic envelope into itself. This process, known as intussusception, is thought to have led to more complex creatures with greater protein requirements. Depending on the presence or absence of ribosomes in the membranes, two types of networks are distinguished:

1. The endoplasmic reticulum is folded. A set of flat structures interconnected and communicating with the nuclear membrane. A large number of ribosomes are attached to it, so its function is to accumulate and release proteins synthesized in ribosomes.

2. The endoplasmic reticulum is smooth. A network of flat and tubular elements that communicates with the folded endoplasmic reticulum. Synthesizes, secretes and transports fats throughout the cell, along with the proteins of the folded reticulum.