4. The flexible sheet of the muscle at the floorof the chest cavity which helps in breathing.

4. The flexible sheet of the muscle at the floorof the chest cavity wh

1.	4. The flexible sheet of the muscle at the floorof the chest cavity which helps in breathing.
Answer» gmThe DIAPHRAGM in the RESPIRATORY system is the dome-shaped SHEET of muscle that separates the chest from the abdomen. It is also referred to the thoracic diaphragm because it's LOCATED in the thoracic cavity, or chest.