Diaphragm
The large dome-shaped muscle (not an organ) that separates the thoracic (chest) cavity from the abdominal cavity and aids in breathing is the diaphragm. Actually fibromuscular, the diaphragm is the main muscle that we use to inflate our lungs. It forms a partition between the two cavities, and creates a 'seal'. It allows the lungs to expand so we can take in and expel air. It is part of both the muscular and respiratory systems.
The stomach is a muscular organ located in the upper abdomen. It stores and breaks down food through muscular contractions and the action of digestive enzymes. The stomach also secretes acid and enzymes to aid in the digestion process.
the main organ of the muscular system is the muscles
The main organ in the muscular system is the muscles.
The liver is the biggest organ in the abdominal cavity.
Lungs
An organ.
An abdominal organ that perforates into the abdominal cavity.
Small intestine is the longest organ of the abdominal cavity. It is about 20 feet long.
muscular organ
The Tongue, a muscular organ.
Liver :)