The impulse for voluntary muscles for forced breathing starts in

Options

A. medualla
B. cerebrum
C. spinai cord
D. vagus nerve

Answer

To answer the question "The impulse for voluntary muscles for forced breathing starts in?", we need to analyze the options provided and understand the role of different parts of the brain in the respiratory process.

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking where the impulses for voluntary muscles involved in forced breathing originate. Forced breathing refers to the active process of inhaling and exhaling, which can be controlled voluntarily.

2. **Identifying the Options**: The options given are:
- A) Medulla
- B) Cerebrum
- C) Spinal cord
- D) Vagus nerve

3. **Role of the Medulla Oblongata**: The medulla oblongata is a crucial part of the brainstem that controls autonomic functions, including respiration. It contains the respiratory centers that regulate the rhythm of breathing.

4. **Role of the Cerebrum**: The cerebrum is involved in higher brain functions, including voluntary actions. While it can influence breathing, it does not directly initiate the respiratory impulses for forced breathing.

5. **Role of the Spinal Cord**: The spinal cord is responsible for transmitting signals between the brain and the body. It plays a role in reflex actions but is not the primary source of respiratory impulses.

6. **Role of the Vagus Nerve**: The vagus nerve is involved in autonomic control of the heart and digestive tract and carries signals from the body to the brain but does not initiate the impulses for forced breathing.

7. **Conclusion**: Based on the functions of these structures, the medulla oblongata is the primary center that generates the impulses for voluntary muscles during forced breathing. Therefore, the correct answer is **A) Medulla**.

### Final Answer:
The impulse for voluntary muscles for forced breathing starts in **A) Medulla**.

---