Endoplasmic Reticulum, Smooth

**Definition:** A type of endoplasmic reticulum lacking associated ribosomes on the membrane surface. It exhibits a wide range of specialized metabolic functions including supplying enzymes for steroid synthesis, detoxification, and glycogen breakdown. In muscle cells, smooth endoplasmic reticulum is called SARCOPLASMIC RETICULUM.

**Tree numbers:** - A11.284.430.214.190.875.248.310

**Synonyms:** - Endoplasmic Reticulum, Agranular