At the time of expiration, the diaphragm becomes
Dome-Shaped
The correct option is C.
Explanation of the correct option: -
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.