Question

During inhalation the diaphragm

• A. Contracts and does not flatten
• B. Does not contract
• C. Contracts and flattens
• D. Expands

Answer 1

The correct option is C

Contracts and flattens

The correct option :C.

The explanation for the incorrect option:

1. The diaphragm, internal and external intercostal muscles, and abdominal muscles are all involved in the process of breathing.
2. The diaphragm contracts during inspiration, moving downwards and flattening out.
3. Intercostal muscles, which are 11 pairs of muscles located between 12 pairs of ribs, also contract.
4. The ribs and sternum are lifted upward and outward as the external intercostal muscles contract, increasing the capacity of the thoracic cavity.

Final answer: During inhalation the diaphragm contracts and flattens.