Question

During expiration the diaphragm becomes _________.

• A. contracted
• B. oblique
• C. flattened
• D. dome shaped

Answer 1

The correct option is D

dome shaped

During expiration, the diaphragm becomes dome-shaped. During this process the thoracic volume decreases as the diaphragm relaxes. Hence, the pressure on the lungs increases and removes the air. The diaphragm thus comes back to its normal shape, which is dome-shaped. Whereas during inspiration the diaphragm contracts and becomes flat.