It's called - the diaphragm (pronounced di-a-fram)
the diaphragm
What is the dome-shaped sheet of muscle that forms the bottom of the chest cavity?The dome-shaped sheet of muscle that forms the bottom of the chest cavity is called Diaphragm.
it will changes the air pressure in the thoratic cavity by increasing or decreasing the thoratic volume
When you inhale the volume increases, because the chest cavity expands to hold your breath.It increases.
Heart
The volume of the chest cavity is reduced on exhalation. Imagine your lungs are balloons. Imagine the volume of a balloon full of air, compared to when it is not inflated. The balloon has a greater volume when it is inflated than when it is deflated - just like the lungs do!
The Diaphragm
Diaphragm
diaphragm
The volume of the chest increases due to the decrease in pressure in the lungs.
The diaphragm separates the thoracic cavity from the abdominopelvic cavity. It is composed of skeletal muscle.
What muscle expand the chest cavity by rotating the ribs upward, contributing to inspiration
inhaling