Question

________ is a dome shaped sheath which separates the thoracic cavity from the abdominal cavity.

Answer 1

Diaphragm:

1. The diaphragm is located below the lungs.
2. It separates the thoracic cavity from the abdominal cavity.
3. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily.
4. It contracts and flattens during inhalation.
5. The diaphragm relaxes and the air is pushed out of the lungs during exhalation.

Final answer: Diaphragm is a dome-shaped sheath which separates the thoracic cavity from the abdominal cavity.