What Is the Function of the Smooth Endoplasmic Reticulum?

Smooth endoplasmic reticulum (SER) (also known as smooth endoplasmic reticulum) is an endoplasmic reticulum without ribosome attachment. It is called a smooth endoplasmic reticulum, which is usually a small membrane tube and a small membrane capsule. Non-flat membrane sac-like, widely exists in various types of cells, including endocrine gland cells, muscle cells, kidney cells, etc. that synthesize cholesterol. ^[1]