During inhalation, the diaphragm:

Options

A. moves downwards
B. moves upwards
C. moves towards left
D. moves towards right

Answer

**Step-by-Step Solution:**

1. **Understanding the Diaphragm's Role**: The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity. It plays a crucial role in the process of breathing.

2. **Inhalation Process**: During inhalation, the diaphragm contracts and moves downward. This action increases the volume of the thoracic cavity.

3. **Pressure Changes**: As the diaphragm moves down, the pressure inside the lungs decreases. This decrease in pressure allows air to rush into the lungs from the outside environment.

4. **Intercostal Muscles**: Along with the diaphragm, the intercostal muscles (located between the ribs) also contract, causing the ribcage to expand. This further aids in reducing the pressure inside the lungs.

5. **Conclusion**: Therefore, during inhalation, the diaphragm moves downward, which is essential for drawing air into the lungs.

**Final Answer**: During inhalation, the diaphragm moves downward.

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