When does anaerobic respiration occur in man and yeast?

Explanation

### Step-by-Step Solution

1. **Understanding Anaerobic Respiration**:
Anaerobic respiration is a type of respiration that occurs in the absence of oxygen. It involves the breakdown of glucose to produce energy without using oxygen.

2. **Anaerobic Respiration in Humans**:
- In humans (and other animals), anaerobic respiration typically occurs during situations of oxygen deficiency.
- This can happen during intense physical activity when the demand for oxygen exceeds the supply.
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