Which structure separates the thoracic and abdominal cavities in mammals?
Show answer and explanation
Correct answer: The diaphragm, a dome-shaped muscular sheet
The diaphragm is a dome-shaped muscular partition unique to mammals. Its rhythmic contractions drive breathing by changing thoracic volume, and it forms the definitive anatomical boundary between the thoracic and abdominal cavities.
Keep practicing
More Reptilia, Aves and Mammalia questions
- Which group of mammals lays eggs?
- Marsupial mammals differ from placentals mainly in:
- Which evolutionary trend is common to reptiles, birds, and mammals?
- Which fossil form is considered a connecting link between reptiles and birds?
- Which feature distinguishes birds from reptiles?
- Which metabolic condition is shared by birds and mammals?