The centres that regulate respiratory rhythm are located in:

Options

A. Cerebrum and cerebellum
B. Pons and midbrain
C. Midbrain and medulla
D. Medulla and pons

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the location of the centers that regulate respiratory rhythm. We need to identify which part of the brain is responsible for this function.

2. **Identifying Relevant Brain Structures**: The respiratory centers are primarily located in the brainstem, which consists of the pons and medulla oblongata.

3. **Locating the Respiratory Centers**:
- The medulla oblongata contains two major groups of neurons involved in respiration:
- The Dorsal Respiratory Group (DRG)
- The Ventral Respiratory Group (VRG)
- The pons contains the Pontine Respiratory Group, which includes:
- The Pneumotaxic Center
- The Apneustic Center

4. **Functions of the Respiratory Centers**: These centers are responsible for generating and maintaining the rhythm of breathing. They also adjust the breathing rate and depth in response to physiological changes, ensuring homeostasis.

5. **Conclusion**: Based on the information, the centers that regulate respiratory rhythm are located in the **medulla oblongata and pons**.

**Final Answer**: The centers that regulate respiratory rhythm are located in **medulla and pons**.

---