In man, during inspiration, the dome-shaped diaphragm becomes:

Options

A. More convex anteriorly
B. More concave posteriorly
C. More or less flat
D. Contract to small size

Answer

To solve the question "In man, during inspiration, the dome-shaped diaphragm becomes:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Anatomy of the Diaphragm**:
- The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. It plays a crucial role in the process of breathing.

2. **Identify the Function of the Diaphragm During Inspiration**:
- During inspiration (the process of inhaling), the diaphragm contracts. This contraction is essential for drawing air into the lungs.

3. **Describe the Change in Shape of the Diaphragm**:
- When the diaphragm contracts, it moves downward and becomes flatter. This change in shape increases the volume of the thoracic cavity, which helps create a vacuum that pulls air into the lungs.

4. **Evaluate the Options Given**:
- The options provided are:
- More concave anteriorly
- More concave posteriorly
- More or less flat
- Contract to a small size
- From our understanding, during inspiration, the diaphragm does not become more concave or contract to a small size. Instead, it becomes more or less flat.

5. **Select the Correct Answer**:
- The correct answer is "more or less flat" because this accurately describes the shape of the diaphragm during the process of inspiration.

### Final Answer:
During inspiration, the dome-shaped diaphragm becomes more or less flat.

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