All the unconscious activities like heartbeat, involuntary breathing and gut peristalsis are controlled by

Options

A. Medulla oblongata
B. Cerebrum and medulla
C. Cerebellum and medulla
D. Cerebrum and cerebellum

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which part of the brain controls unconscious activities such as heartbeat, involuntary breathing, and gut peristalsis.

2. **Identifying the Brain Parts**: The options provided include:
- Medulla oblongata
- Cerebrum
- Cerebellum

3. **Functions of the Brain Parts**:
- **Medulla Oblongata**: This part of the brain is responsible for regulating involuntary functions such as heartbeat, breathing, and gut movements (peristalsis). It is located in the hindbrain.
- **Cerebrum**: This part is associated with higher brain functions, including sensory perception and voluntary motor control.
- **Cerebellum**: This part is mainly involved in coordination and balance, not directly in controlling involuntary actions.

4. **Conclusion**: Since the question specifically mentions unconscious activities that are involuntary, the part of the brain responsible for these functions is the **medulla oblongata**.

5. **Final Answer**: The part of the brain that controls all the unconscious activities like heartbeat, involuntary breathing, and gut peristalsis is the **medulla oblongata**.