Question

At the time of expiration, the diaphragm becomes

• A. Oblique
• B. Normal
• C. Dome-Shaped
• D. Flattened

Answer 1

The correct option is C

Dome-Shaped

The correct option is C.

Explanation of the correct option: -

1. Two phases make up breathing. Atmospheric air is drawn in during inspiration and expelled during expiration.
2. Inspiration happens when the intrapulmonary pressure also known as lung pressure becomes lower than the ambient pressure.
3. Expiration occurs when the intrapulmonary pressure exceeds the ambient pressure. The diaphragm flattens and tightens during inhalation, and the chest cavity widens. A vacuum is produced by this contraction. That causes the lungs to draw air in.
4. The diaphragm unwinds and assumes its original dome-like form after exhalation. The air is then compelled from the lungs. Therefore, during expiration or exhalation, the diaphragm assumes a dome-shaped form.

Explanation of the incorrect options: -

Option A: - The diaphragm is dome-shaped under typical circumstances. It contracts during inspiration, making it flat, and relaxes during expiration.

Option B: - The diaphragm is dome-shaped under typical circumstances. It contracts during inspiration, making it flat, and relaxes during expiration.

Option D: - The diaphragm is dome-shaped under typical circumstances. It contracts during inspiration, making it flat, and relaxes during expiration.

Final Answer: - At the time of expiration, the diaphragm becomes Dome-Shaped.