What are the end products formed during fermentation in yeast? Under what conditions a similar process takes place in our body that leads to muscle cramps?

Explanation

### Step-by-Step Solution:

1. **Understanding Fermentation**:
- Fermentation is an anaerobic process, meaning it occurs in the absence of oxygen. It is primarily carried out by microorganisms, such as yeast.

2. **Fermentation in Yeast**:
- The main substrate for fermentation in yeast is glucose (sugar). During fermentation, glucose is broken down by yeast.

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