Which part of human brain controls involuntary functions of body?

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks which part of the human brain controls involuntary functions of the body.

2. **Define Involuntary Functions**: Involuntary functions are those bodily functions that occur automatically without conscious control. Examples include heart rate, breathing, digestion, and reflex actions.

3. **Locate the Relevant Brain Structure**: The part of the brain responsible for controlling these involuntary functions is the medulla oblongata.

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