In liver cells, the smooth endoplasmic reticulum produces enzymes that help in ______

Explanation

**Step-by-Step Solution:**

1. **Understanding the Smooth Endoplasmic Reticulum (SER):**
- The smooth endoplasmic reticulum (SER) is a type of endoplasmic reticulum that is involved in various metabolic processes. Unlike the rough endoplasmic reticulum, it does not have ribosomes on its surface.

2. **Location in Liver Cells:**
- The SER is found in liver cells, where it plays a crucial role in metabolism and detoxification processes.

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